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Record: oai:ARNO:532503

AuthorC.G.G.J. van Steenis
JournalFlora Malesiana - Series 1, Spermatophyta
AbstractPerennial lactiferous freshwater herbs, rhizome short tuberous with fibrous roots. Leaves radical, submerged or floating, base sheathing, oblong to linear, entire or crisped, often long-petiolate; nerves lengthwise parallel, connected by numerous oblique transverse veins. Spike emerging from the water, simple or 2-8-forked, without bracts, subtended by a mostly caducous basal sheath (spathe). Flowers bisexual (rarely by abortion unisexual), small, spicate-scapose, white, rose, purple, yellow or yellowish-green. Perianth segments 2 (1-3, or absent), equal or unequal, usually persistent. Stamens in 2 rows, 6 (or more), free, hypogynous, persistent; filament filiform; anthers extrorse, small, 2-celled. Pollen subglobose or ellipsoid. Gynaecium superior, apocarpous; carpels 3-6, sessile, each with a simple style. Ovules 1-8 (or more), anatropous. Mature carpels inflated, opening along the back. Seeds without endosperm; outer testa often loose; embryo straight, elongate.
Distr. About 40 spp. described, Africa, Madagascar, Ceylon, SE. Asia, through Malaysia (very rare) to N. Australia, centering in Africa and Madagascar.
Document typearticle
Download paperpdf document http://www.repository.naturalis.nl/document/570330