Common name: Thin Pondweed
Potamogeton australiensis A.Benn. APNI* Description: Emergent aquatic perennial herb, rhizomatous. Stems terete, up to 3 m long; turions not recorded.
Stipules convolute. Submerged leaves petiolate and roundish or sessile and lanceolate; blade cordate, truncate, or tapered at base, acute or rounded at apex, to 13.5 cm long, 1.5–3 cm wide. Transition leaves alternate, petiolate and roundish, translucent. Floating leaves coriaceous; blade roundish, apex acute, 2–6.5 cm long, 1.8–5 cm wide, with 19–32 veins.
Inflorescence a spike, emergent, dense, up to 4 cm long, terminal; peduncle erect, becoming bent when fruiting.
Fruit keeled with 3 ridges, the central one more prominent, with prominent beak, 3–4 mm long (including beak).
Distribution and occurrence: From near the Qld-NSW border south along the coast and tablelands to Victoria; also in Tas and SA (?Qld too) Grows in more or less permanent pools and lagoons, commonly on carbonate- or limestone-derived soils.
NSW subdivisions: NC, CC, SC, NT, CT, ST, SWS
Other Australian states: Vic. Tas. S.A.
Text by SE Papassotiriou et al. (2011); edited KL Wilson (Sept 2011)
Taxon concept: SE Papassotiriou, SWL Jacobs & CB Hellquist, Fl. Australia vol 39 (2011)
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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