Family name: Rutaceae Jussieu
Synonym(s): Amyridaceae Kunth; Aurantiaceae Juss.; Boroniaceae J. Agardh; Cneoraceae Vest, nom. cons.; Correaceae J. Agardh, nom. inval.; Cuspariaceae Tratt., nom. illeg.; Dictamnaceae Vest; Diosmaceae R. Br. ex Bartl.; Diplolaenaceae J. Agardh; Flindersiaceae C. T. White ex Airy Shaw; Fraxinellaceae Nees & Mart., nom. illeg.; Pilocarpaceae J. Agardh; Ptaeroxylaceae J.-F. Leroy; Pteleaceae Kunth; Zanthoxylaceae Martinov
Common name(s): rue or citrus family
*Number of genera/species: 176/2,070
List of genera records in GRIN-Global
For help identifying Citrus, see the Citrus ID tool.
Fruit a berryberry:
an indehiscent, fleshy fruit with one or a few to many seeds. The flesh may be homogenous throughout. Or, if the outer part is hard, firm, or leathery, referred to as an hesperidium. Septa are present in some, and the seeds may be arillate or with a fleshy testa. (hesperidiumhesperidium:
a specialized berry, derived from a compound ovary, in which the outer layer is hard, firm, or leathery), drupedrupe:
(indehiscent drupe) a fleshy, indehiscent fruit with one more hard pits enclosing seeds, derived from single, superior, simple or compound ovary; (dehiscent drupe) a fruit with a dry or fibrous to fleshy or leathery outer husk that early to tardily breaks apart (or opens), exposing one or more nutlike pits enclosing the seeds, samarasamara:
a winged, indehiscent, dry fruit containing a single (rarely two) seed(s), loculicidalloculicidal:
type of capsular dehiscence, opening longitudinally through the locules (compare septicidal)
capsulecapsule:
a dry, dehiscent fruit derived from a compound ovary, rarely septicidalsepticidal:
type of capsular dehiscence, opening longitudinally by separating between the septa of adjacent carpels
, folliclefollicle:
a dry to (rarely) fleshy fruit derived from a single carpel that opens along a single longitudinal suture, derived from a single, superior, simple ovary; the seeds may be arillate or with a fleshy testa (1–5 distinct or basally connate), or schizocarpschizocarp:
usually dry fruit splitting between two or more locules to form distinct, indehiscent, usually one seeded segments; fruit derived from a single, superior or inferior, compound ovary; compare to mericarp splitting into drupeletsdrupelet:
one drupe of a fruit with multiple drupes, as in blackberries
, samarassamara:
a winged, indehiscent, dry fruit containing a single (rarely two) seed(s), or follicle-like fruits, 2.5–150 mm long, globoseglobose:
3D shape—more or less spherical to angularangular:
2D shape—having sides that meet at acute or obtuse angles
, tereteterete:
approximately circular in cross section; width and thickness approximately equal
or flattened in transection, often with stylar beakbeak:
a usually firm, terminal appendage, sometimes tapered (Toddalioideae), sometimes winged (broad encompassing wing, winged at both ends, or terminal wing), with one to many seeds. Pericarppericarp:
fruit wall or fruit coat
blue, black, purple, green, red, orange, yellow, or cream, in berriesberry:
an indehiscent, fleshy fruit with one or a few to many seeds. The flesh may be homogenous throughout. Or, if the outer part is hard, firm, or leathery, referred to as an hesperidium. Septa are present in some, and the seeds may be arillate or with a fleshy testa. pulp color may differ from epicarpepicarp:
outer layer of fruit wall or pericarp, if divided into layers; note here used synonymously with exocarp, texture variable, glabrousglabrous:
without hairs
or pubescent, smooth or gland-dotted, groovedgrooved:
surface relief—linear depressions that may be single or form a series of grooves over the surface, keeledkeel:
a longitudinal ridge, like the keel of a boat, formed by the lengthwise folding of a structure, such as a lemma or palea
, ribbedribbed:
surface relief—wide, prominent, linear ridges that are generally rounded and longitudinally situated on the surface, wartywarty:
surface relief—distinct, rounded projections that are large relative to the fruit size; tuberculate, verrucose (small to large warts), wrinkledwrinkled:
surface relief—shallow, irregular folds and furrows covering the surface; appearing overall though crumpled and then spread out, pittedpitted:
surface relief—surface with small depressions in which the areas between the hollows do not take on the appearance of a true reticular net, punctatepunctate:
surface relief - dotted with pits or with translucent, sunken glands or with colored dots, similar to pitted, or with hornshorn:
a straight or curved, slenderly conic or conoidal protrusion, resembling an animal horn
or prickles. Seed sometimes explosively ejected.
Fruit type by subfamily
Aurantioideae: BerriesBerry:
an indehiscent, fleshy fruit with one or a few to many seeds. The flesh may be homogenous throughout. Or, if the outer part is hard, firm, or leathery, referred to as an hesperidium. Septa are present in some, and the seeds may be arillate or with a fleshy testa., dry or fleshy with thick and hard or thin and leatheryleathery:
texture—moderately thick, tough, and very pliable
epicarpepicarp:
outer layer of fruit wall or pericarp, if divided into layers; note here used synonymously with exocarp. The mesocarpmesocarp:
the middle layer of the pericarp, if divided into layers is often differentiated into layers, which may be woodywoody:
texture—consisting mainly of indurate lignified tissues, characteristic of or resembling wood
, fleshy, or mucilaginousmucilaginous:
resembling mucilage; moist and sticky
. The endocarpendocarp:
the inner layer of the pericarp, if divided into layers is membranousmembranous:
texture—extremely thin, pliable, and fairly tough
, hard and woodywoody:
texture—consisting mainly of indurate lignified tissues, characteristic of or resembling wood
, or soft or pulpy fleshy, sometimes becoming hard when dry. All fruits have a mucilaginousmucilaginous:
resembling mucilage; moist and sticky
pulp surrounding the seeds. In Citrus, the exocarpexocarp:
outer layer of fruit wall or pericarp, if divided into layers; note here used synonymously with epicarp is thin and waxy. The mesocarpmesocarp:
the middle layer of the pericarp, if divided into layers is often differentiated into three layers. The outermost layer is leatheryleathery:
texture—moderately thick, tough, and very pliable
with often sunken, oil glands. The middle layer is thick and spongyspongy:
soft, light, discontinuous but cohesive, and somewhat resilient
, and the inner layer is white. Sometimes the mesocarpmesocarp:
the middle layer of the pericarp, if divided into layers is woodywoody:
texture—consisting mainly of indurate lignified tissues, characteristic of or resembling wood
. The endocarpendocarp:
the inner layer of the pericarp, if divided into layers is membranousmembranous:
texture—extremely thin, pliable, and fairly tough
and pulpy and/or resinous or gum-like.
Flindersioideae: Woodywoody:
texture—consisting mainly of indurate lignified tissues, characteristic of or resembling wood
capsulescapsule:
a dry, dehiscent fruit derived from a compound ovary.
Rutoideae: Thick-skinned and dry capsulescapsule:
a dry, dehiscent fruit derived from a compound ovary or schizocarpsschizocarp:
usually dry fruit splitting between two or more locules to form distinct, indehiscent, usually one seeded segments; fruit derived from a single, superior or inferior, compound ovary; compare to mericarp or thick-skinned and fleshy berriesberry:
an indehiscent, fleshy fruit with one or a few to many seeds. The flesh may be homogenous throughout. Or, if the outer part is hard, firm, or leathery, referred to as an hesperidium. Septa are present in some, and the seeds may be arillate or with a fleshy testa..
Spathelioideae: Dry capsulescapsule:
a dry, dehiscent fruit derived from a compound ovary and folliclesfollicle:
a dry to (rarely) fleshy fruit derived from a single carpel that opens along a single longitudinal suture, derived from a single, superior, simple ovary; the seeds may be arillate or with a fleshy testa or fleshy drupesdrupe:
(indehiscent drupe) a fleshy, indehiscent fruit with one more hard pits enclosing seeds, derived from single, superior, simple or compound ovary; (dehiscent drupe) a fruit with a dry or fibrous to fleshy or leathery outer husk that early to tardily breaks apart (or opens), exposing one or more nutlike pits enclosing the seeds or drupeletsdrupelet:
one drupe of a fruit with multiple drupes, as in blackberries
.
Toddalioideae: BerriesBerry:
an indehiscent, fleshy fruit with one or a few to many seeds. The flesh may be homogenous throughout. Or, if the outer part is hard, firm, or leathery, referred to as an hesperidium. Septa are present in some, and the seeds may be arillate or with a fleshy testa., drupesdrupe:
(indehiscent drupe) a fleshy, indehiscent fruit with one more hard pits enclosing seeds, derived from single, superior, simple or compound ovary; (dehiscent drupe) a fruit with a dry or fibrous to fleshy or leathery outer husk that early to tardily breaks apart (or opens), exposing one or more nutlike pits enclosing the seeds, capsulescapsule:
a dry, dehiscent fruit derived from a compound ovary, samarassamara:
a winged, indehiscent, dry fruit containing a single (rarely two) seed(s), folliclesfollicle:
a dry to (rarely) fleshy fruit derived from a single carpel that opens along a single longitudinal suture, derived from a single, superior, simple ovary; the seeds may be arillate or with a fleshy testa, or schizocarpsschizocarp:
usually dry fruit splitting between two or more locules to form distinct, indehiscent, usually one seeded segments; fruit derived from a single, superior or inferior, compound ovary; compare to mericarp of drupesdrupe:
(indehiscent drupe) a fleshy, indehiscent fruit with one more hard pits enclosing seeds, derived from single, superior, simple or compound ovary; (dehiscent drupe) a fruit with a dry or fibrous to fleshy or leathery outer husk that early to tardily breaks apart (or opens), exposing one or more nutlike pits enclosing the seeds or follicle-like fruits. The epicarpepicarp:
outer layer of fruit wall or pericarp, if divided into layers; note here used synonymously with exocarp in these may be dry, leatheryleathery:
texture—moderately thick, tough, and very pliable
, fleshy, woodywoody:
texture—consisting mainly of indurate lignified tissues, characteristic of or resembling wood
, or membranousmembranous:
texture—extremely thin, pliable, and fairly tough
; mesocarpmesocarp:
the middle layer of the pericarp, if divided into layers fleshy or woodywoody:
texture—consisting mainly of indurate lignified tissues, characteristic of or resembling wood
; endocarpendocarp:
the inner layer of the pericarp, if divided into layers often cartilaginouscartilaginous:
texture—firm, dense, tough, somewhat pliable, and resilient, like cartilage
or undifferentiated.
Seeds globoseglobose:
3D shape—more or less spherical to irregular, sometimes with fold between cotyledons and hypocotyl-radicle or notched, raphaeraphe:
a ridge or seam on the seed coat, formed by the portion of the funiculus united to the ovule wall in longitudinally curved ovules sometimes conspicuous, compressedcompressed:
flattened; in grasses, used to denote compression (not necessarily flattened) either laterally or dorsiventrally
or flattened in transection, 1.5–60 mm long. Apically and/or dorsally winged (Flindersioideae, Spathelioideae, some genera in Toddalioideae). ArilsAril:
(broad sense) appendicular structure that wholly or partly envelops a seed and is produced from or a modification of the funicle, raphe, or outer integument; usually fleshy or pulpy, sometimes spongy or tufted-capillate, often brightly colored or elaiosomeselaiosome:
a lipid and protein-rich fleshy structure attached to some seeds and fruits, it attracts ants which then disperse the disseminule (e.g., caruncle in the Euphorbiaceae, the aril (outgrowth of the funiculus) in the Fabaceae) sometimes present. If present, arilsaril:
(broad sense) appendicular structure that wholly or partly envelops a seed and is produced from or a modification of the funicle, raphe, or outer integument; usually fleshy or pulpy, sometimes spongy or tufted-capillate, often brightly colored linear fleshy, brown, yellow, or white. Or vestigial arilsaril:
(broad sense) appendicular structure that wholly or partly envelops a seed and is produced from or a modification of the funicle, raphe, or outer integument; usually fleshy or pulpy, sometimes spongy or tufted-capillate, often brightly colored (pellicles), red or black. Sometimes spongy-fleshy sarcotestassarcotesta:
pulpy or fleshy outer layer of the seed coat, simulates aril present. Seed coat black, bluish black, purplish, brown, gray, green, red, yellow, or white, sometimes spotted or mottledmottled:
with colored spots, streaks, or blotches of a different color, dulldull:
reflecting only a low proportion of incident light, with no apparent sheen or shinyshiny:
uniformly reflecting a high proportion of incident light at all angles, glabrousglabrous:
without hairs
or pubescent, leatheryleathery:
texture—moderately thick, tough, and very pliable
, scalyscaly:
surface relief—covered with small, thin, fine scales or flakes that may be removable, fleshy (spongyspongy:
soft, light, discontinuous but cohesive, and somewhat resilient
), hard, paperypapery:
texture—papyraceous, chartaceous; very thin, pliable, and readily torn; like paper
, or membranousmembranous:
texture—extremely thin, pliable, and fairly tough
, glabrousglabrous:
without hairs
or pubescent, sometimes densely so, smooth or groovedgrooved:
surface relief—linear depressions that may be single or form a series of grooves over the surface, ridgedridged:
surface relief—raised, thick ridges, sharp edged or rounded, usually in a series that may cover the entire surface, wrinkledwrinkled:
surface relief—shallow, irregular folds and furrows covering the surface; appearing overall though crumpled and then spread out, wartywarty:
surface relief—distinct, rounded projections that are large relative to the fruit size; tuberculate, verrucose, granulargranular:
surface relief—having a grainy surface, reticulatereticulate:
surface relief—netted, raised walls or concave grooves forming a net-like surface pattern with flat, concave, or convex interspaces, alveolatealveolate:
surface relief—reticulated, honeycombed; ridges that intersect to form polygonal cells with a regular size and shape similar to a honeycomb, bubbled, or papillatepapillate:
surface relief—bearing minute, distinct, broad-based projections, tapering to a rounded apex. Inner layer of seed coat often with thick, dense, black sclerenchyma. In Aurantioideae, seed coat fibrousfibrous:
texture—long, flexible threads, thicker than hairs, that densely cover and obscure the surface and mucilaginousmucilaginous:
resembling mucilage; moist and sticky
. HilaHilum:
on seeds, the scar indicating where the funiculus was attached; on grass caryopses, the scar visible on the outer fruit surface revealing where the seed is attached on the inner fruit wall surface; or in Asteraceae cypselae, the scar visible on the outer fruit wall revealing where the fruit was attached to the receptacle often larger than punctatepunctate:
surface relief - dotted with pits or with translucent, sunken glands or with colored dots, similar to pitted, linearlinear:
(shape) long, narrow, and uniform in width; (of embryo) embryo is straight and much longer than wide, ellipticelliptic:
2D shape—oval, oblong-like with the 2 ends narrowing and more or less alike
, or circularcircular:
(of embryo) linear embryo is curved into an "O" shape, short as or as long as seed, rarely a large cavity. In some genera, seed coat forms a subhilar rumination (bump or groove) near hilumhilum:
on seeds, the scar indicating where the funiculus was attached; on grass caryopses, the scar visible on the outer fruit surface revealing where the seed is attached on the inner fruit wall surface; or in Asteraceae cypselae, the scar visible on the outer fruit wall revealing where the fruit was attached to the receptacle.
Embryo well developed, completely to nearly completely filling seed coat, sometimes more than one per seed, relatively large, sometimes green, axileaxile:
on or of the axis
and centric, rarely peripheralperipheral:
(of embryo) embryo is curved around the outer edge of the seed, near the seed coat
(Cneoridium), foliatefoliate:
appearing leaf-like
, linearlinear:
(shape) long, narrow, and uniform in width; (of embryo) embryo is straight and much longer than wide, or ellipticelliptic:
2D shape—oval, oblong-like with the 2 ends narrowing and more or less alike
, straight or curvedcurved:
(of embryo) linear embryo is curved into an arch or horseshoe with the ends far apart, with spatulatespatulate:
2D shape—like a spatula; rounded at the apex, with base long and tapered; (of embryo) embryo is straight and axile and centric with the cotyledons expanded to form the shape of a spatula or spoon; (of cotyledons) cotyledons expanded and wider than the stalk but not invested into the stalk or investinginvesting:
(of embryo) embryo is nearly or completely filling seed coat, straight, and axile and centric with spatulate cotyledons and covering the stalk for at least half its length; (of cotyledons) cotyledons spatulate and covering the stalk for at least half its length
cotyledons. Cotyledons thin to thick, flat and folded.
Endosperm copious, scanty, or absent, if copious, soft or hard fleshy, smooth.
Fruit | |
Type | berryberry: an indehiscent, fleshy fruit with one or a few to many seeds. The flesh may be homogenous throughout. Or, if the outer part is hard, firm, or leathery, referred to as an hesperidium. Septa are present in some, and the seeds may be arillate or with a fleshy testa. ![]() a specialized berry, derived from a compound ovary, in which the outer layer is hard, firm, or leathery ![]() (indehiscent drupe) a fleshy, indehiscent fruit with one more hard pits enclosing seeds, derived from single, superior, simple or compound ovary; (dehiscent drupe) a fruit with a dry or fibrous to fleshy or leathery outer husk that early to tardily breaks apart (or opens), exposing one or more nutlike pits enclosing the seeds ![]() a winged, indehiscent, dry fruit containing a single (rarely two) seed(s) ![]() type of capsular dehiscence, opening longitudinally through the locules (compare septicidal) ![]() a dry, dehiscent fruit derived from a compound ovary ![]() type of capsular dehiscence, opening longitudinally by separating between the septa of adjacent carpels ![]() a dry to (rarely) fleshy fruit derived from a single carpel that opens along a single longitudinal suture, derived from a single, superior, simple ovary; the seeds may be arillate or with a fleshy testa ![]() usually dry fruit splitting between two or more locules to form distinct, indehiscent, usually one seeded segments; fruit derived from a single, superior or inferior, compound ovary; compare to mericarp ![]() one drupe of a fruit with multiple drupes, as in blackberries or follicle-like fruits |
Size range | 2.5 - 150 mm long |
Shape(s) | globoseglobose: 3D shape—more or less spherical ![]() 3D shape—elliptic , oblongoblong: 2D shape—much longer than broad with nearly parallel sides, corners are rounded ![]() 3D shape—ovate ![]() 3D shape—a cylinder, with parallel sides and a circular cross-section; tubular or rod-shaped , angularangular: 2D shape—having sides that meet at acute or obtuse angles (pentagonous, cuboidal, quadrangularquadrangular: 2D shape - four-sided, as in a square or rectangle ![]() 2D or 3D shape—kidney-shaped ![]() |
Texture | leatheryleathery: texture—moderately thick, tough, and very pliable , woodywoody: texture—consisting mainly of indurate lignified tissues, characteristic of or resembling wood , fleshy, chartaceouschartaceous: papery, papyraceous , membranousmembranous: texture—extremely thin, pliable, and fairly tough |
Surface relief | smooth, gland-dotted, groovedgrooved: surface relief—linear depressions that may be single or form a series of grooves over the surface ![]() a longitudinal ridge, like the keel of a boat, formed by the lengthwise folding of a structure, such as a lemma or palea ![]() surface relief—wide, prominent, linear ridges that are generally rounded and longitudinally situated on the surface ![]() surface relief—distinct, rounded projections that are large relative to the fruit size; tuberculate, verrucose ![]() surface relief—shallow, irregular folds and furrows covering the surface; appearing overall though crumpled and then spread out ![]() surface relief—surface with small depressions in which the areas between the hollows do not take on the appearance of a true reticular net ![]() surface relief - dotted with pits or with translucent, sunken glands or with colored dots, similar to pitted ![]() a straight or curved, slenderly conic or conoidal protrusion, resembling an animal horn or prickles |
Color(s) | blue, black, purple, green, red, orange, yellow, cream |
Unique features | Fruits highly variable. Brightly colored berriesberry: an indehiscent, fleshy fruit with one or a few to many seeds. The flesh may be homogenous throughout. Or, if the outer part is hard, firm, or leathery, referred to as an hesperidium. Septa are present in some, and the seeds may be arillate or with a fleshy testa. ![]() texture—moderately thick, tough, and very pliable rinds dotted with sunken oil glands and compressedcompressed: flattened; in grasses, used to denote compression (not necessarily flattened) either laterally or dorsiventrally or flattened mucilaginousmucilaginous: resembling mucilage; moist and sticky seeds embedded in pulpy or resinous gummy-pulp are often encountered. |
Seed | |
Size range | 1.5 - 60 mm long |
Shape(s) | globoseglobose: 3D shape—more or less spherical ![]() 2D shape—shaped like half a sphere , ellipsoidellipsoid: 3D shape—elliptic , lens-shapedlens-shaped: 2D shape—round and flattened with two curved (convex) surfaces , ovoidovoid: 3D shape—ovate ![]() 3D shape—cone-shaped, with the point of attachment at the broad end ![]() 2D shape—triangular and tapering to a point at the base ![]() 2D shape—having sides that meet at acute or obtuse angles , reniformreniform: 2D or 3D shape—kidney-shaped ![]() |
Surface relief | smooth, groovedgrooved: surface relief—linear depressions that may be single or form a series of grooves over the surface ![]() surface relief—raised, thick ridges, sharp edged or rounded, usually in a series that may cover the entire surface ![]() surface relief—shallow, irregular folds and furrows covering the surface; appearing overall though crumpled and then spread out ![]() surface relief—distinct, rounded projections that are large relative to the fruit size; tuberculate, verrucose ![]() surface relief—having a grainy surface ![]() surface relief—netted, raised walls or concave grooves forming a net-like surface pattern with flat, concave, or convex interspaces ![]() surface relief—reticulated, honeycombed; ridges that intersect to form polygonal cells with a regular size and shape similar to a honeycomb ![]() surface relief—bearing minute, distinct, broad-based projections, tapering to a rounded apex ![]() |
Color(s) | black, bluish black, purplish, brown, gray, green, red, yellow, white, sometimes spotted or mottledmottled: with colored spots, streaks, or blotches of a different color ![]() |
Unique features | Seeds often compressedcompressed: flattened; in grasses, used to denote compression (not necessarily flattened) either laterally or dorsiventrally or flattened with large, variously shaped hilahilum: on seeds, the scar indicating where the funiculus was attached; on grass caryopses, the scar visible on the outer fruit surface revealing where the seed is attached on the inner fruit wall surface; or in Asteraceae cypselae, the scar visible on the outer fruit wall revealing where the fruit was attached to the receptacle ![]() |
Other | |
Embryo | well developed, completely to nearly completely filling seed coat, sometimes more than one per seed, relatively large, sometimes green, axileaxile: on or of the axis and centric, rarely peripheralperipheral: (of embryo) embryo is curved around the outer edge of the seed, near the seed coat (Cneoridium), foliatefoliate: appearing leaf-like , linearlinear: (shape) long, narrow, and uniform in width; (of embryo) embryo is straight and much longer than wide ![]() 2D shape—oval, oblong-like with the 2 ends narrowing and more or less alike ![]() (of embryo) linear embryo is curved into an arch or horseshoe with the ends far apart ![]() 2D shape—like a spatula; rounded at the apex, with base long and tapered; (of embryo) embryo is straight and axile and centric with the cotyledons expanded to form the shape of a spatula or spoon; (of cotyledons) cotyledons expanded and wider than the stalk but not invested into the stalk ![]() (of embryo) embryo is nearly or completely filling seed coat, straight, and axile and centric with spatulate cotyledons and covering the stalk for at least half its length; (of cotyledons) cotyledons spatulate and covering the stalk for at least half its length cotyledons. Cotyledons thin to thick, flat and folded. |
Nutritive tissue | endosperm copious, scanty, or absent, if copious, fleshy-soft or -hard, smooth |
Distribution map courtesy of Angiosperm Phylogeny Website.
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*The number of genera and species is based on Christenhusz and Byng 2016Christenhusz and Byng 2016:
Christenhusz MJM and Byng JW. 2016. The number of known plant species in the world and its annual increase. Phytotaxa 261 (3): 201-217. https://doi.org/10.11646/phytotaxa.261.3.1, which may differ from the number of genera in GRIN-Global.