Jasarum

Scientific name

Jasarum G.S. Bunting

Family

Araceae

Similar genera

Aponogeton, Crinum, Cryptocoryne, Cyperus, Damasonium, Echinodorus, Sagittaria, Triglochin

Native distribution

endemic endemic:
(adj) restricted to a certain geographical location
to Venezuela, Guyana

Species cultivated

not currently cultivated

Adventive distribution

none

Weed status

not weedy

Habit

submerged submerged:
(adj) (syn. submersed) under water; submerged below the water surface
herb with emergentemergent:
(adj) (syn. emersed) with parts raised out of the water; extending up out of the water
inflorescences

Brief description

Long-leaved aroid; Rhizomatousrhizomatous:
(adj) possessing rhizomes
. Stems thick, unbranched or rarely branched. Leaves submergedsubmerged:
(adj) (syn. submersed) under water; submerged below the water surface
; petiolepetiole:
(n) the stalk of a leaf
fleshy, sheath long; leaf bladeblade:
(n) (syn. lamina) the flat, expanded part of a leaf, frond, or petal (excluding, e.g., the petiole)
linear, somewhat bullatebullate:
(adj) having a pimpled or blistered surface
; apexapex:
(n) the point farthest from the point of attachment; the tip (often pointed)
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
to cuspidatecuspidate:
(adj) with a short, sharp, abrupt tip (cusp)
; base cuneatecuneate:
(adj) wedge-shaped; triangular, with narrow end at the base
; venationvenation:
(n) the arrangement of veins in a leaf
reticulatereticulate:
(adj) in the form of a network; netted (often of leaf veins)
, midribmidrib:
(n) the main or central vein, line or rib in a leaf or perianth segment
prominent, primary laterallateral:
(adj) on or pertaining to the side of an organ or structure
veins joined into submarginal collective vein. Inflorescenceinflorescence:
(n) the arrangement of flowers on the floral axis
a solitary spathespathe:
(n) a large bract or bracts subtending and often enclosing an inflorescence
and spadixspadix:
(n) a spike of small flowers borne on a thick, fleshy axis
; spathespathe:
(n) a large bract or bracts subtending and often enclosing an inflorescence
erect, constricted between tube and limblimb:
(n) the expanded portion of a petal or bract (e.g., a spathe)
, tube convoluteconvolute:
(adj) rolled up or rolled together longitudinally, as leaves or petals in bud
, persistentpersistent:
(adj) (of leaves etc,) remaining attached; not being dropped or falling off
, limblimb:
(n) the expanded portion of a petal or bract (e.g., a spathe)
open, apexapex:
(n) the point farthest from the point of attachment; the tip (often pointed)
long-acuminate, never reflexedreflexed:
(adj) abruptly curved or bent downward
, bronze-green outside, cream inside; spadixspadix:
(n) a spike of small flowers borne on a thick, fleshy axis
shorter than spathespathe:
(n) a large bract or bracts subtending and often enclosing an inflorescence
. Flowers lack a perianthperianth:
(n) collective term for the calyx and corolla of a flower; also used for floral whorl(s) in which the calyx and corolla cannot be resolved; any of the leaves or bracts surrounding the sex organs of bryophytes
. Berry fleshy, subovoid, dull maroon-green, stigmastigma:
(n) the portion of the pistil that is receptive to pollen
persistentpersistent:
(adj) (of leaves etc,) remaining attached; not being dropped or falling off
.

Natural habitat

in oligotrophic (blackwater) streams, tropical uplands

Additional comments

A monotypicmonotypic:
(adj) represented by a single example (species)
genus, Jasarum steyermarkii G.S. Bunting is the only fully submergedsubmerged:
(adj) (syn. submersed) under water; submerged below the water surface
(without any floating or emergentemergent:
(adj) (syn. emersed) with parts raised out of the water; extending up out of the water
leaves) aquatic species in the family.