Common name: Clasped Pondweed
Potamogeton perfoliatus L. APNI* 
Description: Submerged rhizomatous aquatic perennial producing turions; stems trailing, terete, branched, to 3 m long.
Leaves ovate, to 6 cm long and 40 mm wide, translucent, base stem-clasping, margins undulate, entire; free from the stipular sheath; stipular sheath membranous, falling early, to 1 cm long, surrounding the stem above the node, visible on young stems.
Inflorescence a dense spike, emergent, to 2 cm long when in fruit.
Nutlets 2–3 mm long, convex on ventral side and semi-circular on the dorsal, laterally compressed, ± smooth with a very short beak.
Flowering: during warmer months.
Distribution and occurrence: Eastern half of NSW; also southeast Qld, Vic and Tas In permanent waterbodies; often grows in fast-flowing water in only a few cm of substrate; reasonably salt-tolerant.
NSW subdivisions: NC, CC, SC, NT, CT, ST, NWS, CWS, SWP
Other Australian states: Qld Vic. Tas.
Text by S. W. L. Jacobs & S. Papassotiriou (1993); SE Papassotiriou et al. (2011); edited KL Wilson (Sept 2011)
Taxon concept: Flora of NSW 4 (1993); 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.
|
