Common name: Marshwort
Nymphoides montana Aston APNI* 
Description: Robust perennial with stolons to several metres long.
Basal leaves with lamina ± circular, to c. 10 cm diam., base strongly cordate, margins entire or shallowly crenate; petiole to c. 70 cm long.
Inflorescence open and floating with pairs of flowers at each node. Flowers heterostylous with styles of 2 lengths. Calyx lobes 5–10 mm long. Corolla lobes 10–20 mm long, yellow, with a transverse row of hairs near the base, margins laciniate.
Seeds laterally compressed, smooth and shining, c. 1–1.5 mm long, c. 1 mm wide; caruncle present but inconspicuous.
Flowering: summer–autumn.
Distribution and occurrence: Grows in still or slow-flowing water to c. 1.5 m deep on a variety of substrates; south from Walcha area.
NSW subdivisions: CC, NT, CT, ST
Other Australian states: Vic.
Treated as part of Nymphoides geminata in some earlier literature.
Text by S. W. L. Jacobs
Taxon concept: Flora of NSW 3 (1992)
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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