Zannichellia palustris L. APNI* 
Description: Submerged monoecious weakly rhizomatous aquatic annual or perennial.
Leaves mostly opposite; ligule longer than the sheath, 2–7 cm long, < 1 mm wide, margins entire, the midvein dividing before the apex, apex acute with a minute mucro.
Male flower without a perianth and with a single 4-sporangiate anther. Female flower with perianth cup-like and c. 1 mm long; carpels mainly 3, each with a short style c. 1 mm long and an asymmetric funnel-shaped stigma c. 0.2 mm across.
Fruit dorsally curved and mostly with tubercles on dorsal surface, 2–4 mm long.
Flowering: during warmer months.
Distribution and occurrence: Grows in fresh or slightly saline stationary or slowly flowing water.
NSW subdivisions: NC, CC
Other Australian states: S.A.
Threatened species: NSW BCA: Endangered
This species is considered data-deficient by Saving our Species (SoS, DPIE) which means a conservation project cannot be developed for it. Visit their website and contact SoS if you have additional information.
Sometimes this polymorphic taxon is divided into 5 species.
Text by S. W. L. Jacobs
Taxon concept: Flora of NSW 4 (1993)
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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