Spirodela polyrhiza (L.) Schleid. APNI*
Synonyms: Lemna polyrhiza L. APNI*
Description: Herb floating at surface of water; roots 5–18.
Thallus elliptic to obovate, 3–10 mm long, 5–10 mm wide, flat, length to breadth ratio 1–1.5, with 7–16 veins; upper surface yellow-green; lower surface usually purplish.
Flowers not recorded in Aust.
Distribution and occurrence: in still or slowly moving freshwater; apparently widespread.
NSW subdivisions: NC, CC, SC, CT, SWS
Other Australian states: Qld N.T.
Spirodela was formerly placed in Lemnaceae.
Text by B. J. Conn
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
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