Wolffia australiana (Benth.) Hartog & Plas APNI*
Synonyms: Wolffia arrhiza var. australiana Benth. APNI*
Description: Herb floating at water surface; roots absent.
Thallus boat-like, with length of upper emergent surface up to twice breadth; upper surface, 0.5–1.0 mm long, 0.3–0.8 mm wide, 0.8–1.3 mm high, length to breadth ratio 1.3–2, uniformly green and shining, slightly convex and rounded laterally; lower surface laterally compressed.
Flowering: flowers recorded April.
Distribution and occurrence: in freshwater dams and waterholes; chiefly south from Orange district.
NSW subdivisions: CC, SC, NT, CT, ST, CWS
Other Australian states: Vic. S.A.
Wolffia was formerly placed in Lemnaceae.
Text by B.J. Conn, Flora of New South Wales Vol. 4: 38 (1993), in Lemnaceae
Taxon concept: Australian Plant Census (accessed May 2017)
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.