Common name: Pondweed
Potamogeton cheesemanii A.Benn. APNI* Description: Emergent aquatic perennial herb, rhizomatous. Stems terete, up to 2 m long; turions not recorded.
Stipules convolute. Submerged leaves sessile to shortly petiolate; blade lanceolate, tapered at apex and base, 5–10 cm long, 0.5–2.5 cm wide. Floating leaves petiolate; blade ovate to lanceolate, tapered to rounded at base, obtuse to apiculate at apex, coriaceous, 1.5–5 cm long, 1.5–3.5 cm wide, with 10–17 veins.
Inflorescence a spike, emergent, dense, 1–2.5 cm long, terminal; peduncle erect, slightly recurved when fruiting.
Fruit reddish, brownish or green, smooth or crenulated, with 3 dorsal keels, the central keel more prominent than the lateral keels, with prominent beak, 3–5 mm long (including beak).
Flowering: Warmer months
Distribution and occurrence: SE NSW and inland in the Riverina. Also southern Australia from WA to Tasmania; New Zealand. Grows in permanent waterbodies.
NSW subdivisions: CC, SC, NT, CT, ST, CWS, SWS, SWP
Other Australian states: Vic. Tas. S.A. W.A.
Has been confused with P. tricarinatus and associated species in the past.
Text by KL Wilson and SWL Jacobs (April 2009); 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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