Regnellidium

Scientific name

Regnellidium Lindm.

Common names

two-leaved marsilea

Family

Marsileaceae

Similar genera

Glossostigma, Marsilea

Native distribution

South America

Species cultivated

Regnellidium diphyllum Lindm.

Adventive distribution

none

Weed status

not weedy

Habit

creeping, rhizomatousrhizomatous:
(adj) possessing rhizomes
fern with floating or emergentemergent:
(adj) (syn. emersed) with parts raised out of the water; extending up out of the water
leaves

Brief description

Perennialperennial:
(adj) (of a plant) having a life cycle of more than two years
water fern. Rhizomerhizome:
(n) an underground stem, usually growing horizontally, from which both roots and shoots emerge directly; the thick, above-ground stem of ferns
creeping. Leaves on elongate petioles, at regularregular:
(adj) uniform in shape or structure; radially symmetrical and parts similar in size and arrangement
intervals along rhizomerhizome:
(n) an underground stem, usually growing horizontally, from which both roots and shoots emerge directly; the thick, above-ground stem of ferns
, rolled when young; leaf bladeblade:
(n) (syn. lamina) the flat, expanded part of a leaf, frond, or petal (excluding, e.g., the petiole)
2-lobed. Sporangiasporangium:
(n) (pl. sporangia) a unicellular or multicellular sac or structure that produces spores
in closed sporocarps.

Natural habitat

shallow water and wet ground

Additional comments

Commonly cultivated for pond margins. Regnellidium has a similar growth habit to Marsilea.