Abd El-Ghani, M., Karam, M., Abd El-Baky, F. and Ali, R. (2011). Taxonomic relationships in Veronica sect. Beccabunga (Plantaginaceae s.l.) of Egypt: evidences from morphometric and molecular analyses. Phytologia Balcanica, 17(1): 35-44.
Abe, D.S., Sidagis-Galli, C., Matsumura-Tundisi, T., Tundisi, J.E.M., Blanco, F.P., Faria, C.R.L. and Tundisi, J.G. (2015). Additional list of species of aquatic macrophytes in the lower basin of the Xingu River. Brazilian Journal of Biology, 75(3): 70-77.
Abrams, L. (1941). A New Limnanthes from Oregon. Madroño, 6: 27.
Abrams, L. (1951). Illustrated Flora of the Pacific States: Washington, Oregon, and California. vol. 3. Stanford University Press, Stanford, CA. 863 pp. DOI (accessed May 3, 2016)
Acevedo-Rodriguez, P. and Strong, M.T. (2005). Monocotyledons and gymnosperms of Puerto Rico and the Virgin Islands. Contributions from the United States National Herbarium, 52: 1-415.
Adams, P. (1962). Studies in the Guttiferae. I. A synopsis of Hypericum section Myriandra. Contributions from the Gray Herbarium of Harvard University, 189: 3-51.
African Plant Database (version 3.4.0). Conservatoire et Jardin botaniques de la Ville de Genève and South African National Biodiversity Institute, Pretoria. http://www.ville-ge.ch/musinfo/bd/cjb/africa (accessed July 18, 2016)
Aguilar, N.O. and Lemmens, R.H.M.J. (1999). Oldenlandia L. PROSEA (Plant Resources of South-East Asia) Foundation, Bogor, Indonesia. http://www.proseanet.org (accessed January 25, 2016)
Ahles, H.E. (1959). Thalictrum cooleyi sp. nov. Brittonia, 11(2): 68-70.
Alaska Center for Conservation Science, University of Alaska Anchorage (2016). Non-Native Plant Species List. http://accs.uaa.alaska.edu/invasive-species/non-native-plant-species-list (accessed March 9, 2016)
Alaska Exotic Plant Management Team, National Park Service (2016). Invasive Plant Species of Alaska. https://www.nps.gov/akso/natres/epmt/species.html (accessed March 9, 2016)
Allen, B. (2010). Bryophyte Flora of North America, Provisional Publication: Fontinalaceae-Fontinalis. http://www.mobot.org/plantscience/BFNA/V2/FontFontinalaceae.htm (accessed January 19, 2017)
Allgayer, R. and Teton, J. (1987). The Complete Book of Aquarium Plants. Ward Lock Limited, London. 157 pp.
Anderson, P.J. (2011). Identifying Commonly Cultivated Palms. In: A Resource for Pests and Diseases of Cultivated Palms. Florida Department of Agriculture and Consumer Service, Division of Plant Industry and Identification Technology Program, CPHST, PPQ, APHIS, USDA; Fort Collins, CO. http://idtools.org/id/palms/palmid (accessed April 11, 2016)
Andrews, H. (1800). The Botanists Repository: comprising colour'd engravings of new and rare plants only. Publisher not identified, London. DOI (accessed January 20, 2016)
The Aquatic Plant Society (2014). The World of Bucephalandra. http://www.theaquaticplantsociety.org/world-of-bucephalandra (accessed November 23, 2015)
Aquatic Weed Control LLC (2004). Aquatic Weed Control Online Aquatic Plant Identification Utility. Megalondonta beckii. http://www.awc-america.com/plant_id_utility/plants/megbec.html (accessed December 10, 2015)
Argus, G.W. (1997). Infrageneric classification of Salix (Salicaceae) in the New World. Systematic Botany Monographs, 52: 1-121.
Aston, H.I. (1973). Aquatic Plants of Australia. Melbourne University Press, Victoria. 368 pp.
Atlas of Living Australia (2016) http://bie.ala.org.au (accessed December 3, 2015 - March 17, 2016)
Australian Biological Resources Study (2002). Flora of Australia. vol. 43. ABRS/CSIRO, Canberra. 406 pp.
Australian National Botanic Garden, Centre for Plant Biodiversity Research, Flora of New South Wales. Cumulative Glossary for Vascular Plants. http://www.anbg.gov.au/glossary/fl-nsw.html (accessed September 10, 2006]
Australian National Botanic Gardens (2012). Ferns of Australia and PNG. http://www.anbg.gov.au/fern/ (accessed December 21, 2015 - March 17, 2016)
Australian National Botanic Gardens. (2016). Growing Native Plants on the web. Australian Government, Canberra. https://www.anbg.gov.au/gnp/index.html (accessed January 4, 2016)
Bacigalupo, N.M. and Cabral, E.L. (1999). Revisi&o acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;n de las especies Americanas del g&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;nero Diodia (Rubiaceae, Spermacoceae). Darwiniana, 37(1-2): 153-165.
Baensch, H. A. and Riehl, R. (1989). Baensch Aquarium Atlas. vol. 1. Tetra Press, Virginia. pp. 992.
Baensch, H. A. and Riehl, R. (1993). Baensch Aquarium Atlas. vol. 2. Tetra Press, Virginia. pp. 1212.
Baensch, H. A. and Riehl, R. (1996). Baensch Aquarium Atlas. vol. 3. Tetra Press, Virginia. pp. 1104.
Bailey, L.H. (1917). The Standard Cyclopedia of Horticulture. vol. 2. The Macmillan Company, New York. pp. 603-1200. DOI (accessed March 29, 2016)
Bakalin, V. (2011). Bryophyte Flora of North America, Provisional Publication: Jungermannia. http://www.mobot.org/plantscience/BFNA/V3/JungJungermannia.htm (accessed February 16, 2016)
Barkworth, M.E., Capels, K.M., Long, S., Anderton, L.K. and Piep, M.B. (2007). Luziola, published in Barkworth et al. (eds.), Flora of North America vol. 24. http://herbarium.usu.edu/treatments/Luziola.htm (accessed June 9, 2016)
Bastmeijer, J.D. (2014) The Crypts pages. http://crypts.home.xs4all.nl/Cryptocoryne/index.html (accessed November 9, 2016)
Batista, J.A.N., de Bem Bianchetti, L. and de J.G. Miranda, Z. (2006). A Revision of Habenaria Section Macroceratitae (Orchidaceae) in Brazil. Brittonia, 58(1): 10-41.
Batista, J.A.N., Silva, J.B.F. da and Bianchetti, L. de Bem. (2008). The genus Habenaria (Orchidaceae) in the Brazilian Amazon. Brazilian Journal of Botany, 31(1), 105-134.
Bellair, G. and Saint-L&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;ger, L. (1900). Les Plantes de Serre: description, culture, emploi des espèces ornmentales ou int&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;ressantes cultiv&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;es dans les serres de l'Europe. Octave Doin, Paris. 1672 pp. DOI (accessed March 29, 2016)
Benson A.J., Fuller, P.L. and Jacono, C.C. (2001) Summary Report of Nonindigenous Aquatic Species in U.S. Fish and Wildlife Service Region 4. U.S. Geological Survey, Florida Caribbean Science Center. 68 pp.
Bentham, G. (1861). Flora Hongkongensis: a description of the flowering plants and ferns of the island of Hongkong. Lovell Reeve, London. 482 pp. DOI (accessed December 30, 2015)
Berazain, R. (2009). The extinct Flora of Cuba. Bissea, 3(2).
Bertuzzi, T. (2013). Flor&i acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;stica de ecossistemas aqu&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;ticos tempor&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;rios na região de Pelotas, Rio Grande do Sul, Brazil. Masters dissertation. Universidade Federal de Santa Maria. 207 pp. http://w3.ufsm.br/ppgagrobio/Dissertacoes2013.html (accessed January 12, 2016)
Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A. (2016). Flora of Zambia. http://www.zambiaflora.com (accessed January 25, 2016)
Biodiversity Explorer (2016). Declared weeds and invader plants in South Africa. http://www.biodiversityexplorer.org/plants/weeds_and_invaders/index.htm (accessed February 9 - June 3, 2016)
Board of Trustees of the Royal Botanic Gardens, Kew Science. Discover plants and fungi http://www.kew.org/science-conservation/plants-fungi (accessed April 18 - May 9, 1026]
Board of Trustees of the Royal Botanic Gardens, Kew. Adopt a seed: Chamaegigas intrepidus. http://www.kew.org/support-kew/adopt-a-seed/chamaegigas-intrepidus.htm (accessed May 9, 2016)
Boedeker, C. and Immers, A. (2009). No more lake balls (Aegagropila linnaei Kützing, Cladophorophyceae, Chlorophyta) in The Netherlands? Aquatic Ecology, 43: 891.
Boedeker, C., Eggert, A., Immers, A. and Smets, E. (2010). Global decline of and threats to Aegagropila linnaei, with special reference to the Lake Ball habit. BioScience, 60(3): 187-198.
Bogner, J. and Boyce, P.C. (2009). Studies on the Schismatoglottideae (Araceae) of Borneo VI: a new Schismatoglottis species from Sarawak, Malaysian Borneo. Gardens' Bulletin Singapore, 60(2): 1-9.
Bogner, J. and Hay, A. (2000). Schismatoglottideae (Araceae) in Malesia II - Aridarum, Bucephalandra, Phymatarum and Piptospatha. Telopea, 9(1): 179-222.
Bogner, J. and Nicolson, D.H. (1991). A revised classification of Araceae with dichotomous keys. Willdenowia, 21(1/2): 35-50.
Botanic Gardens Trust, National Herbarium of New South Wales. PlantNet Flora Online. Glossary of Botanical Terms. http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&glossary;=yesα=A (accessed November 9, 2016)
Botanic Gardens Trust, National Herbarium of New South Wales. PlantNet Flora Online. http://plantnet.rbgsyd.nsw.gov.au/floraonline.htm (accessed September 20, 2006]
Botanical Society of the British Isles and the Biological Records Centre (2016). Online Atlas of the British & Irish Flora. http://www.brc.ac.uk/plantatlas/index.php?q=title_page (accessed November 14, 2016)
Botanical.com. A Modern Herbal, online (1995-2016). http://botanical.com/botanical/mgmh/comindx.html (accessed December 12, 2015)
Botanicheskii institut (Akademiia nauk SSSR) (1970). Flora of the U.S.S.R. vol. 7. Israel Program for Scientific Translations, Jerusalem. 615 pp. http://biodiversitylibrary.org/page/30147223#page/9/mode/1up (accessed April 18, 2016)
Botha, C.J. and Venter, E. (2002). Plants poisonous to livestock Southern Africa (CD-ROM). Cotula nigellifolia. University of Pretoria, South Africa. http://hdl.handle.net/2263/8526 (accessed December 8, 2015)
Boyce, P.C. (2008). A review of Alocasia (Araceae: Colocasieae) for Thailand including a novel species and new species records from south-west Thailand. Thai Forest Bulletin (Botany), 36: 1-17.
Boyce, P.C. and Croat, T.B. (2011 onwards). The Überlist of Araceae, Totals for Published and Estimated Number of Species in Aroid Genera. http://www.aroid.org/genera (accessed March 21, 2016)
Boyce, P.C. and Wong, S.Y. (2012). The Araceae of Indomalaya I: Piptospatha N.E.Br. Aroideana, 35.
Boyce, P.C. and Wong, S.Y. (2012). The Araceae of Indomalaya II: Piptospatha N.E.Br. Malayan Nature Journal, 64(1): 9-32.
Boyce, P.C., Medecilo, M.P. and Wong, S.Y. (2015). A new and remarkable aquatic species of Schismatoglottis (Araceae) from the Philippines. Willdenowia, 45(3): 405-408.
Braggins, J.E., Renner, M.A.M. and de Lange, P.J. (2014). Additions to the liverwort flora of the Kermadec Islands, New Zealand Botanical Region. Telopea, 17: 183-194.
Braithwaite, R. (1887-1905). The British Moss-Flora. vol. 2. L. Reeve & Co., London. 268 pp. DOI (accessed February 22, 2016)
Braz, D.M. and Monteiro, R. (2005). Staurogyne rubescens (Acanthaceae), a new species from southeastern Brazil. Novon, 15(1): 55-58.
Breitwieser I., Brownsey, P.J., Nelson, W.A., Wilton, A.D. eds. (2010-2016) Flora of New Zealand Online - Taxon Profiles. http://www.nzflora.info (accessed March 25 - April 12, 2016)
Brisbane City Council. Weed Identification Tool. http://weeds.brisbane.qld.gov.au (accessed March 14, 2016)
British Bryological Society (2016). BBS Field Guide online pages. http://rbg-web2.rbge.org.uk/bbs/Activities/BBSFGspac.htm (accessed January 27 - February 16, 2016)
Britton, N.L. and Brown, A. (1913). An Illustrated Flora of the Northern United States, Canada, and the British Possessions. vol. 3. Charles Scribner's Sons, New York. 2052 pp. https://books.google.com/books?id=RohIAAAAYAAJ&printsec;=frontcover#v=onepage&q;&f;=false (accessed December 23, 2015 - February 23, 2016)
Brown, P.M., Dueck, L.A. and Cameron, K.M. (2008). Spiranthes stellata (Orchidaceae), a new species of ladies'-tresses from the western United States. North American Native Orchid Journal, 14(1): 2-21.
Bungartz, F., Herrera, H.W., Jaramillo, P., Tirado, N., Jim&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;nez-Uzc&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;tegui, G., Ruiz, D., Gu&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;zou, A. and Ziemmeck, F. (eds.) (2009). Charles Darwin Foundation Galapagos Species Checklist - Lista de Especies de Gal&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;pagos de la Fundaci&o acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;n Charles Darwin. Charles Darwin Foundation/Fundaci&o acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;n Charles Darwin, Puerto Ayora, Galapagos. http://www.darwinfoundation.org/datazone/checklists (accessed November 21, 2016)
Bunting, G.S. (1960). A revision of Spathiphyllum (Araceae). Memoirs of the New York Botanical Garden, 10(3): 1-53.
Bureau of Land Management/USDA Forest Service. Interagency Special Status/Sensitive Species Program (ISSSSP) (2014). http://www.fs.fed.us/r6/sfpnw/issssp/planning-documents/species-guides.shtml (accessed January 27, 2016)
ByeungHoa, K. and SangIn, S. (2002). Overall status of naturalized plants in Korea. Korean Journal of Weed Science, 22(3): 207-226.
Byrnes, N.B. (1984). A revision of Melaleuca L. (Myrtaceae) in northern and eastern Australia, 1. Austrobaileya, 2(1): 65-76.
Byrnes, N.B. (1985). A revision of Melaleuca L. (Myrtaceae) in northern and eastern Australia, 2. Austrobaileya, 2(2): 131-146.
Byrnes, N.B. (1986). A revision of Melaleuca L. (Myrtaceae) in northern and eastern Australia, 3. Austrobaileya, 2(3): 254-273.
CABI (2016). Invasive Species Compendium. Wallingford, UK: CAB International. http://www.cabi.org/isc (accessed December 2015 - November 2, 2016)
California Department of Fish and Wildlife (2016). California Threatened and Endangered Plant Profiles. https://www.wildlife.ca.gov/Conservation/Plants/Endangered (accessed March 14, 2016)
California Invasive Plant Council (2010). Wildland Weed News. Cal-IPC News, 18(1): 1-16. http://cal-ipc.org/resources/news (accessed December 23, 2015)
Canadian Wildlife Service, Invasive Plants of Natural Habitats in Canada, Environment Canada. Flowering-rush (Butomus umbellatus L.) https://www.ec.gc.ca/eee-ias/78D62AA2-55A4-4E2F-AA08-538E1051A893/invasives.pdf (accessed November 9, 2016)
Cantino, P.D. (1981). The Physostegia purpurea-Leptophylla denticulata problem: taxonomic and nomenclatural clarification. Rhodora, 83(836): 581-593.
Caudales, R., Vega Hern&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;ndez, E., S&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;nchez-P&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;rez, A. and Liogier, H.A. (2000). Aquatic and wetland plants of Puerto Rico. I. Pteridophyta. Anales Jard&i acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;n Bot&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;nico de Madrid, 57(2): 333-339.
Caulerpa Working Group (October 2005). National Management Plan for the Genus Caulerpa. (PDF)
Center for Aquatic and Invasive Plants, University of Florida (2016). http://plants.ifas.ufl.edu (accessed December 2, 2015 - January 22, 2016)
Center for Invasive Species Management (2014). State and Province Noxious Weed Lists. http://www.weedcenter.org/resources/state.html (accessed September 6, 2016)
Centre for Australian National Biodiversity Research (2016). National Species List. https://biodiversity.org.au/nsl/services (accessed November 14, 2016)
Chafin, L.G. (2007). Field Guide to the Rare Plants of Georgia. University of Georgia Press, Athens, Georgia. 526 pp.
Chambers, T.C. and Farrant, P.A. (2001). Revision of Blechnum (Blechnaceae) in Malesia. Blumea, 46: 283-350.
Champion, P.D., Burnett, D.A. and Petroeschevsky, A. (2008). Risk assessment of tradeable aquatic plant species in Australia. NIWA, Australia.
Chapman, A.W. (1897). Flora of the Southern United States: containing an abridged description of the flowering plants and ferns of Tennessee, North and South Carolina, Georgia, Alabama, Mississippi, and Florida: arranged according to the natural system. American Book Company, New York. 655 pp. DOI (accessed March 14, 2016)
Cheeseman, T.F. (1906). Manual of the New Zealand Flora. John Mackay, Government Printer, New Zealand. 1199 pp. DOI (accessed June 13, 2016)
Chen, C.-J., Monro, A.K. and Chen, L. (2007). Name changes for Chinese Pilea (Urticaceae). Novon, 17(1): 24-26.
Chowdhury, D. and Konwar, B.K. (2006). Morphophenology and karyotype study of Patidoi (Schumannianthus dichotomus (Roxb.) Gagnep. Synonym Clinogyne dichotoma Salisb.) - a traditional plant of Assam. Current Science, 91(5): 648-651.
Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora. http://www.kew.org/data/grasses-db.html (accessed June 9, 2016)
Cole, P. (1996). A Botanical Glossary with particular emphasis on terms pertaining to the study of carnivorous plants (rev. 1.5) http://journal.plantae.sk/carnivorous/info/glossary/gloss_o.htm (accessed November 9, 2016)
Collett, A.B. (1933). A Taxonomic Comparison of the Northwestern Species of Cicuta and Oenanthe. Oregon State Agricultural College. http://hdl.handle.net/1957/51430 (accessed June 15, 2016)
Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga (2007). http://cookislands.bishopmuseum.org/search.asp (accessed January 11, 2016)
Cook, B.G., Pengelly, B.C., Brown, S.D., Donnelly, J.L., Eagles, D.A., Franco, M.A., Hanson, J., Mullen, B.F., Partridge, I.J., Peters, M. and Schultze-Kraft, R. (2005). Tropical Forages: an interactive selection tool. (accessed CD-ROM]., CSIRO, DPI&F;(Qld), CIAT and ILRI, Brisbane, Australia. http://www.tropicalforages.info (accessed May 11, 2016)
Cook, C.D.K. (1974). Water Plants of the World: A manual for the identification of the genera of freshwater macrophytes. Junk, The Hague, The Netherlands. 561 pp.
Cook, C.D.K. (1996). Aquatic and Wetland Plants of India. Oxford University Press, New York, NY. 385 pp.
Cook, C.D.K. (1996). Aquatic Plant Book. SPB Academic Publishing, The Hague, The Netherlands. 228 pp.
Cook, C.D.K. and Lüönd, R. (1982). A revision of the genus Hydrocharis (Hydrocharitaceae). Aquatic Botany, 14: 177-204.
Cook, C.D.K. and Lüönd, R. (1982). A revision of the genus Nechamandra (Hydrocharitaceae). Aquatic Botany, 13: 505-513.
Cook, C.D.K. and Lüönd, R. (1983). A revision of the genus Blyxa (Hydrocharitaceae). Aquatic Botany, 15: 1-52.
Cook, C.D.K., and Urmi-König, K. (1983). A revision of the genus Limnobium including Hydromystria (Hydrocharitaceae). Aquatic Botany, 17: 1-27.
Cook, C.D.K., and Urmi-König, K. (1983). A revision of the genus Stratiotes (Hydrocharitaceae). Aquatic Botany, 16: 213-249.
Cook, C.D.K., and Urmi-König, K. (1984). A revision of the genus Egeria (Hydrocharitaceae). Aquatic Botany, 19: 73-96.
Cook, C.D.K., and Urmi-König, K. (1984). A revision of the genus Ottelia (Hydrocharitaceae). 2. The species of Eurasia, Australia and America. Aquatic Botany, 20: 131-177.
Cook, C.D.K., and Urmi-König, K. (1985). A revision of the genus Elodea (Hydrocharitaceae). Aquatic Botany, 21: 111-156.
Cook, C.D.K., Symoens, J.J. and Urmi-König, K. (1984). A revision of the genus Ottelia (Hydrocharitaceae). 1. Generic considerations. Aquatic Botany, 18: 263-274.
Cooke, D.A. (1992). A taxonomic revision of Centrolepis (Centrolepidaceae) in Australia. Journal of the Adelaide Botanic Garden, 15(1): 1-63.
Cooke, M.C. (1894). Handbook of British Hepaticae: containing descriptions and figures of the indigenous species of Marchantia, Jungermannia, Riccia and Anthoceros. W. H. Allen & Co., London. 310 pp. DOI (accessed February 16, 2016)
Cooke, T. (1908). Flora of the Presidency of Bombay. vol. 2. Taylor and Francis, London. 1083 pp. DOI (accessed March 1, 2016)
Correll, D.S. and Correll, H.B. (1975). Aquatic and Wetland Plants of Southwestern United States. vol. 1. Stanford University Press, California. 1777 pp.
Coulter, J.M., & Rose, J.N. (1900). Monograph of the North American Umbelliferae. Contributions from the U.S. National Herbarium, 7(1): 9-256.
Cowie, I.D., Short, P.S. and Osterkamp Madsen, M. (2000). Floodplain Flora. A Flora of the Coastal Floodplains of the Northern Territory, Australia. CSIRO, Australia. 382 pp.
Croat, T.B. (2004). Revision of Dieffenbachia (Araceae) of Mexico, Central America, and the West Indies. Annals of the Missouri Botanical Garden, 91(1): 668-772.
Crow, G.E. and Hellquist, C.B. (2000). Aquatic and Wetland Plants of Northeastern North America. Vol. 1: Pteridophytes, Gymnosperms, and Angiosperms: Dicotyledons, 480 pp.; Vol. 2: Angiosperms: Monocotyledons, 400 pp. University of Wisconsin Press, Madison.
Crum, H. (1973). Mosses of the Great Lakes Resort. University Herbarium, University of Michigan, Ann Arbor. 404 pp. http://www.biodiversitylibrary.org/item/45700#page/1/mode/1up (accessed February 22, 2016)
CSIRO (2010). Australian Tropical Rainforest Plants. http://keys.trin.org.au/key-server/data/0e0f0504-0103-430d-8004-060d07080d04/media/Html/taxon/index.htm (accessed December 7 - 30, 2015)
DAISIE European Invasive Alien Species Gateway (2008). http://www.europe-aliens.org/default.do (accessed May 13, 2016)
Dalzell, N.A. and Gibson, A. (1861). The Bombay Flora: or, short descriptions of all the indigenous plants hitherto discovered in or near the Bombay presidency. Education Society's Press, Bombay. 332 pp. DOI (accessed March 1, 2016)
Damsholt, K. and V&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;na, J. (1977). The genus Jungermannia L. emend. Dumort. (Hepaticae) in Greenland. Lindbergia, 4(1/2): 1-26.
Daniel, T.F. (2011). Justicia (Acanthaceae) in Texas. Journal of the Botanical Research Institute of Texas, 5(2): 595-618.
Darlington, W. (1847). Agricultural Botany: an enumeration and description of useful plants and weeds, which merit the notice, or require the attention, of American agriculturists. J. W. Moore, Philadelphia. 270 pp. DOI (accessed March 15, 2016)
Darlington, W. (1859). American Weeds and Useful Plants: being a second and illustrated edition of agricultural botany: an enumeration and description of useful plants and weeds, which merit the notice, or require the attention of American agriculturists. A. O. Moore & Company, New York. 460 pp. DOI (accessed March 15, 2016)
de Lange, P.J., Rolfe, J.R. and Townsend, A.J. (2011). Crassula natans var. minus (Crassulaceae) a new trans-Tasman natural weed arrival to northern New Zealand. New Zealand Journal of Botany, 49(3): 361-366.
de Lange, P.J., Rolfe, J.R., Champion, P.D., Courtney, S.P., Heenan, P.B., Barkla, J.W., Cameron, E.K., Norton, D.A. and Hitchmough, R.A. (2013). Conservation status of New Zealand indigenous vascular plants, 2012. New Zealand: Department of Conservation. 70 pp. http://nzpcn.org.nz (accessed December 19, 2015)
de Magalhaes, T.L., da Costacosta:
(n) midvein of leaf or pinna or rachis of pinnately compound leaf
Bortoluzzi, R.L. and Mantovani (2016). Plant distribution in freshwater wetlands of the Brazilian subtropical highland grasslands. Brazilian Journal of Botany, 39(1): 239-249.
Department of Environment, Water and Natural Resources, the Government of South Australia (2007). eFloraSA: Electronic Flora of South Australia. http://www.flora.sa.gov.au/factsheets.html (accessed January 4, 2016)
Department of Primary Industries, Parks, Water and Environment, Tasmania. Weeds Index - Declared Weeds. http://dpipwe.tas.gov.au/invasive-species/weeds/weeds-index/weeds-index-declared-weeds (accessed February 11, 2016)
Department of Primary Industries, Parks, Water and Environment, Tasmania. Threatened Species Section (2016). http://dpipwe.tas.gov.au/conservation/threatened-species/lists-of-threatened-species/threatened-species-vascular-plants (accessed December 29, 2015)
Department of Primary Industries, Parks, Water and Environment, Tasmania (2016). Weed Risk Assessment: Oenanthe pimpinelloides. http://dpipwe.tas.gov.au/invasive-species/weeds/environmental-weeds/weed-risk-assessment-scoresheets-reports (accessed November 14, 2016)
DiTomaso, J.M. and Healy, E.A. (2003) Aquatic and Riparianriparian:
(adj) growing by rivers or streams; of, adjacent to, or living on, the banks of a river, lake, pond, etc.
Weeds of the West. UCANR Publications, Oakland, California. 442 pp.
Dodd-Olswold, L. (2016). Texas Wetland Plants L.L.C. http://www.texaswetlandplants.com/Species_Availibility_D2OQ.html (accessed November 9, 2016)
Don, G. (1831). A General History of the Dichlamydeous Plants. vol. 1. J.G. and F. Rivington, London. 818 pp. DOI (accessed March 15, 2016)
d'Orbigny, C. (1861). Dictionnaire Universel d'Histoire Naturelle. tome 9. L. Houssiaux, Paris. 776 pp. DOI8 (accessed January 20, 2016)
Doyle, W.T. and Stotler, R.E. (2006). Contributions toward a bryoflora of California III. Keys and annotated species catalogue for liverworts and hornworts. Madroño, 53(2): 89-197.
Drury, H. (1869). Hand-book of the Indian Flora; being a guide to all the flowering plants hitherto described as indigenous to the continent of India. vol. 3. Richardson & Co., London. 708 pp. DOI (accessed January 20, 2016)
Earle, C.J. (2014). The Gymnosperm Database. http://www.conifers.org/index.php (accessed January 27, 2016)
Eastwood, A. (1932). Bottle-brushes in Californian gardens and parks. Leaflets of Western Botany, 1(4): 25-32.
Ebihara, A., Dubuisson, J.-Y., Iwatsuki, K., Hennequin, S. and Ito, M. (2006). A taxonomic revision of Hymenophyllaceae. Blumea, 51(2): 1-60.
eFloras (2008). Arboles y arbustos de los Andes del Ecuador. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. http://efloras.org/flora_page.aspx?flora_id=201 (accessed December 15, 2015)
eFloras (2008). Chinese Plant Names. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. http://www.efloras.org/flora_page.aspx?flora_id=3 (accessed December 16, 2015 - June 3, 2016)
eFloras (2008). Digital Flora of Taiwan. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. http://efloras.org/flora_page.aspx?flora_id=100 (accessed November 16, 2015 - May 24, 2016)
eFloras (2008). Flora of Chile. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. http://www.efloras.org/flora_page.aspx?flora_id=60 (accessed November 24, 2015 - December 10, 2015)
eFloras (2008). Flora of China. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. http://www.efloras.org/flora_page.aspx?flora_id=2 (accessed November 16, 2015 - November 2, 2016)
eFloras (2008). Flora of North America. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. http://www.efloras.org/flora_page.aspx?flora_id=1 (accessed November 16, 2015 - November 2, 2016)
eFloras (2008). Flora of Pakistan. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. http://www.efloras.org/flora_page.aspx?flora_id=5 (accessed November 17, 2015 - October 5, 2016)
eFloras (2008). Gramineae in Flora of Taiwan. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. http://www.efloras.org/flora_page.aspx?flora_id=1050 (accessed December 2, 2015)
Eggli, U. (2001). Illustrated Handbook of Succulent Plants: Monocotyledons. Springer Berlin Heidelberg, Germany. 354 pp.
eMonocot. http://emonocot.org (accessed November 2015 - November 2, 2016)
Encyclopedia of Life. http://www.eol.org (accessed November 2015-October 2016)
Engler, A. and Macfarlane, J.M. (1908). Das Pflanzenreich: Regni vegetabilis conspectus. Verlag von Wilhelm Engelmann, Leipzig. 39 pp. http://bibdigital.rjb.csic.es/ing/Libro.php?Libro=1762 (accessed March 17, 2016)
Engler, A. and Prantl, K. (1909). Die natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten insbesondere den Nutzpflanzen. teil 1, abt. 3, halfte 1. Wilhelm Engelmann, Leipzig. 700 pp. DOI (accessed February 17, 2016)
Entwisle, T.J., Sonneman, J.A. and Lewis, S.H. (1997) Freshwater Algaealgae:
(n) (sing. alga) photosynthetic, eukaryotic, unicellular or complex multicellular organisms, mainly aquatic, lacking true stems, roots, leaves, conducting vessels, and complex sex organs
in Australia. Sainty and Associates, Australia, 242 pp.
European and Mediterranean Plant Protection Organization (2006). EPPO data sheet on Invasive Plants, Heracleum mantegazzianum. https://www.eppo.int/QUARANTINE/data_sheets/plants/HERMZ_ds.pdf (accessed May 10, 2016)
European and Mediterranean Plant Protection Organization (2015). EPPO Lists of Invasive Alien Plants. https://www.eppo.int (accessed November 2015 - October 2016)
The Exotic Rainforest (2011). http://www.exoticrainforest.com/index.html (accessed January 14, 2016)
Fall Wildflowers of New England (2004). http://www.bio.brandeis.edu/fieldbio/Wildflowers_Kimonis_Kramer/PAGES/MAIN.html (accessed March 9, 2016)
Fassett, N.C. (1940). A Manual of Aquatic Plants. Reprint 1972. University of Wisconsin Press, Madison. 405 pp.
Featon, Mr. and Mrs. E.H. (1889). The Art Album of New Zealand Flora; being a systematic and popular description of the native flowering plants of New Zealand and the adjacent islands. vol. 1. Office of Messrs. Bock & Cousins, Wellington, N.Z. 180 pp. https://books.google.com/books?id=0NEYAAAAYAAJ&printsec;=frontcover#v=onepage&q;&f;=false (accessed June 13, 2016)
Fern, K. (2014). Useful Tropical Plants Database. http://tropical.theferns.info (accessed December 21, 2015)
Ferns of Western Australia. http://fernswa.myspecies.info (accessed March 17, 2016)
Ferrell, J.A., MacDonald, G.E. and Leon R. (2015). Benghal Dayflower (Commelina benghalensis, L.) Identification and Control (SS-AGR-223). Gainesville: University of Florida Institute of Food and Agricultural Sciences. http://edis.ifas.ufl.edu/ag230 (accessed November 2, 2016)
FLEPPC (2015). List of Invasive Plant Species. Florida Exotic Pest Plant Council. http://www.fleppc.org/list/list.htm (accessed June 9, 2016)
FLIP: Florida Invasive Plants (2011). http://www.plantatlas.usf.edu/flip (accessed January 22, 2016)
Flora of Australia Online. Australian Biological Resources Study, Canberra. http://www.environment.gov.au/biodiversity/abrs/online-resources/flora/main/index.html (accessed December 19, 2015)
Flora of North America Editorial Committee (1993). Flora of North America North of Mexico. vol. 2. Oxford University Press, New York. 475 pp.
Flora of North America Editorial Committee (2000). Flora of North America North of Mexico. vol. 22. Oxford University Press, New York. 384 pp.
Flora of North America Editorial Committee (2007). Flora of North America North of Mexico. vol. 24. Oxford University Press, New York. 944 pp.
Florentin, M.N., Fader, A.C. and Gonzalez, A.M. (2016). Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae). Acta Botanica Brasilica, online. http://www.scielo.br/scielo.php?script=sci_arttext&pid;=S0102-33062016005012103 (accessed December 7, 2016)
Florida Natural Areas Inventory (FNAI). http://fnai.org/InvasivesInfoPages.cfm (accessed January 22, 2016)
Floridata.com LLC (2015). http://floridata.com (accessed January 22, 2016)
Flowers of India (2005). http://flowersofindia.net (accessed December 3, 2015 - January 11, 2016)
Flowgrow (2006-2013) http://flowgrow.de/db/aquaticplants (accessed December 16, 2015 - March 11, 2016)
Fosberg, F.R. and Terrell, E.E. (1985). A recently established exotic in west Florida and Alabama (Hedyotis salzmannii or Oldenlandia salzmannii; Rubiaceae). Castanea, 50(1): 49-51.
Fox, A. and Bryson, C. (1998). Wetland Nightshade (Solanum tampicense): A Threat to Wetlands in the United States. Weed Technology, 12(2): 410-413.
Freire-Fierro, A. (2002). Monograph of Aciotis (Melastomataceae). Systematic Botany Monographs, 62: 1-99.
Furuki, T. and Tan, B.C. (2013). Taxonomical studies of the family Aneuraceae (Marchantiophyta) of Singapore. Natural History Research, 12(2): 71-79.
Galka Okhapkina (1998-2016). The Encyclopedia of House Plants. http://www.gflora.com (accessed December 2, 2015 - January 11, 2016)
Garc&i acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;a-Mendoza, A.J. (2010). Especie nueva de Hymenocallis (Amaryllidaceae) de Oaxaca y Puebla, M&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;xico. Revista Mexicana de Biodiversidad, 81(3): 625-628.
GBIF Secretariat: GBIF Backbone Taxonomy (2016). http://www.gbif.org/species (accessed November 23, 2015 - September 14, 2016)
Georgia Department of Natural Resources. Rare Plant Species. http://www.georgiawildlife.com/speciesinfo/plants (accessed April 27, 2016)
Gibson, N. (2014). An amphibiousamphibious:
(adj) of a plant able to live on land or in water
Goodenia (Goodeniaceae) from an ephemeral arid zone wetland. Nuytsia, 24: 23-28.
Gilman, E.F. (2014). Chamaedorea elegans Parlor Palm, Neanthe Bella (FPS119). Gainesville: University of Florida Institute of Food and Agricultural Sciences. https://edis.ifas.ufl.edu/fp119 (accessed April 11, 2016)
Global Invasive Species Database (2016). http://issg.org/database/welcome/ (accessed September 20, 2006 - October 5, 2016)
Global Invasive Species Database (2016). http://www.iucngisd.org/gisd (accessed December 10, 2015 - November 2, 2016)
Gluch, O. (2005). Pinguicula species (Lentibulariaceae) from the southeastern United States: observations of different habitats in Florida. Acta Botanica Gallica, 158(2): 197-204.
Godfrey, R.K. and Stripling, H.L. (1961). A synopsis of Pinguicula (Lentibulariaceae) in the southeastern United States. The American Midland Naturalist, 66(2): 395-409.
Godfrey, R.K. and Wooten, J.W. (1979). Aquatic and Wetland Plants of Southeastern United States. The University of Georgia Press, Athens. 728 pp.
Godfrey, R.K. and Wooten, J.W. (1981). Aquatic and Wetland Plants of Southeastern United States: Dicotyledons. The University of Georgia Press, Athens. 933 pp.
Goldblatt, P. and Manning, J. (2000). Cape Plants: A conspectus of the Cape Flora of South Africa. National Botanical Institute, Pretoria. http://posa.sanbi.org/flora/browse.php?src=CP (accessed March 15, 2016)
Gonz&a acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;lez-Torres, L.R., Rankin, R. and Palmarola, A. (eds) (2012). Invasive plants in Cuba. (Plantas Invasoras en Cuba.) Bissea: Boletin sobre Conservacion de Plantad del Jardin Botanico Nacional, 6(1): 1-140.
Gottsche, C.M., Lindenberg, J.B.G., and Nees von Esenbeck, C.G. (1844). Synopsis Hepaticarum: coniunctis studiis scripserunt et edi curaverunt. Meissnerianis, Hamburgi. 835 pp. DOI (accessed February 16, 2016)
Govaerts, R. (2013). Hellenia Retz., the correct name for Cheilocostus C.D.Specht (Costaceae). Phytotaxa, 151(1): 63-64.
Graham, S.A., Diazgranados, M., and Barber, J.C. (2011). Relationships among the confounding genera Ammannia, Hionanthera, Nesaea and Rotala (Lythraceae). Botanical Journal of the Linnean Society, 166(1): 1–19
Grant, A.L. (1924). A monograph of the genus Mimulus. Annals of the Missouri Botanical Garden, 11(1): 99-388.
Gray, A. (1889). Manual of the Botany of the Northern United States, Including the District East of the Mississippi and North of North Carolina and Tennessee. American Book Company, New York. 760 pp. DOI (accessed December 28, 2015)
GRiSP (Global Rice Science Partnership) (2013). Rice almanac, 4th edition. Los Baños. International Rice Research Institute, Philippines. 283 pp.
Grout, A.J. (1905). Mosses with a hand-lens. The author, New York. 208 pp. DOI (accessed January 27, 2016)
Guiry, M.D. and Guiry, G.M. (2015). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org (accessed November 19, 2015)
Hall, H.M. (1910). Studies in ornamental trees and shrubs. University of California Publications in Botany, 4(1): 1-74.
Hammer, R.L. (2014). Everglades Wildflowers: A field guide to wildflowers of the historic Everglades, including Big Cypress, Corkscrew, and Fakahatchee Swamps. FalconGuides, Guilford. 256 pp.
Harley, R.M. (2012). Checklist and key of genera and species of the Lamiaceae of the Brazilian Amazon / Lista e chaves para gêneros e esp&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;cies de Lamiaceae da Amazônia brasileira. Rodrigu&e acuteacute:
(adj) tapering to a sharp, pointed apex with more or less straight sides; broader than acuminate; forming an angle of less than 90 degrees
;sia, 63(1): 129-144.
Harley, W. (1955). The ferns of Liberia. Contributions from the Gray Herbarium of Harvard University, (177): 58-101.
Harmonia database (2016). Belgian Forum on Invasive Species. http://ias.biodiversity.be (accessed July 26, 2016)
Harrington, H.D. (1957). How to Identify Plants. Swallow Press, Chicago. 203 pp.
Harris, J.G. and Harris, M.W. (1994). Plant Identification Terminology, An Illustrated Glossary. Spring Lake Publishing, Spring Lake, Utah. 188 pp.
Harvey, W.H. and Sonder, O.W. (1864-1865). Flora Capensis: Being a systematic description of the plants of the Cape colony, Caffraria, & Port Natal. vol. 3. Hodges, Smith, and Co., Dublin. 633 pp. DOI (accessed April 26, 2016)
Harvey, W.H. and Sonder, O.W. (1904). Flora Capensis: Being a systematic description of the plants of the Cape colony, Caffraria, & Port Natal. vol. 4, part 2. L. Reeve & Co., Ashford, Kent. 479 pp. https://books.google.com/books?id=9xcyAQAAMAAJ&printsec;=frontcover#v=onepage&q;&f;=false (accessed May 3, 2016)
Haskins, M.L. (1985). Anatomy and systematics of Penthorum L. Master's Theses. Paper 493. http://scholarship.richmond.edu/masters-theses (accessed March 10, 2016)
Haslam, S.M. (1978). River Plants. Cambridge University Press, Cambridge. 396 pp.
Hawaiian Ecosystems at Risk project (HEAR). Plant species introduced to Galapagos (2005) http://www.hear.org/galapagos/invasives/topics/management/plants/projects/species.htm (accessed November 2015 - October 2016)
Hawaiian Ecosystems at Risk project (HEAR). Global Compendium of Weeds (2007). http://www.hear.org/gcw (accessed November 2015 - October 2016)
Hay, A. (1998). The genus Alocasia (Araceae-Colocasieae) in West Malesia and Sulawesi. Gardens' Bulletin Singapore, 50: 221-334.
Heilmeier, H. and Hartung, W. (2014). The aquatic resurrection plant Chamaegigas intrepidus - adaptation to multiple abiotic stresses and habitat isolation. Botanica Serbica, 38(1): 69-80.
Hewson, H.J. (1970). The family Aneuraceae in Australia and New Guinea: II. The genus Riccardia. Proceedings of the Linnean Society of New South Wales, 95(422-424): 60-121.
Hickman, J.C. and Jepson, W.L. (1993). The Jepson manual: Higher plants of California. University of California Press, Berkeley. 1400 pp.
Hill, K. (2006). Indian River Lagoon Species Inventory, Acrostichum aureum. Smithsonian Marine Station at Fort Pierce, Florida. http://www.sms.si.edu/irlspec/Acrost_aureu.htm (accessed March 17, 2016)
Hilty, J. (2002-2016). Illinois Wildflowers. http://www.illinoiswildflowers.info/index.htm (accessed February 24 - May 10, 2016)
Hitchcock, A.S. (1920). The North American species of Isachne. Contributions from the United States National Herbarium, 22(3): 115-121.
Hitchcock, A.S. and Chase, A. (1910). The North American Species of Panicum. vol. 15. Government Printing Office, Washington. 396 pp. https://books.google.com/books?id=ywkaAAAAYAAJ&printsec;=frontcover&vq;=repens#v=onepage&q;&f;=false (accessed May 3, 2016)
Hodel, D. (1992). Chamaedorea Palms, The Species and Their Cultivation. The International Palm Society. http://www.palmweb.org/cdm_dataportal/taxon/987e74e7-15b4-4aa0-9ba1-0541920530c0 (accessed April 11, 2016)
Hoek, C.V.D. (1963). Revision of the European Species of Cladophora. E. J. Brill, Leiden. 248 pp. https://books.google.com/books?id=rMoUAAAAIAAJ&printsec;=frontcover&source;=gbs_ge_summary_r&hl;=en#v=onepage&q;&f;=false (accessed November 19, 2015)
Holttum, R.E. (1951). The Marantaceae of Malaya. Garden's Bulletin Singapore, 8(2): 254-296.
Hooker, J.D. (1894). The Flora of British India. vol. 6. L. Reeve & Co., London. 740 pp. DOI (accessed March 1, 2016)
Horst, A., and Kipper, H. (1986). The Optimum Aquarium. AD Aquadocumenta Verlag, Bielefeld, Germany. 203 pp.
Hotchkiss, N. (1972) Common Marsh, Underwater & Floating-leaved Plants of the United States and Canada. Dover Publications Inc., New York. 252 pp.
House, H.D. (1918). Wild Flowers of New York. part 1. The University of the State of New York, New York. 185 pp. DOI (accessed February 12, 2016)
Hoyer, M.V., Canfield, D.E.,