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Nymphoides spinulosperma Aston
Family Menyanthaceae
Common name: Marbled Marshwort

Nymphoides spinulosperma Aston APNI*

Description: Robust perennial with stolons to 1.5 m long.

Basal and cauline leaves floating; petiole length dependant on water depth; blade very broad-ovate to almost circular, to 12 cm diam., cordate to almost half way, usually with a pinkish spot near petiole attachment, often with various dark markings elsewhere; margin entire to slightly crenate.

Inflorescence open and floating with pairs of flowers at each node. Flowers heterostylous with styles of 2 lengths. Calyx lobes 7.5–15 mm long. Corolla lobes 12–25 mm long yellow, with a transverse row of hairs near the base and without a median wing; margins laciniate.

Seeds laterally compressed, 1–1.5 mm long, c. 1 mm wide; covered with fine acute spinules to c. 0.5 mm long; caruncle more or less conspicuous.

Flowering: Flowers summer–autumn.

Distribution and occurrence: Grows in still or slow-flowing water to c. 1 m deep.
NSW subdivisions: NWP
Other Australian states: Qld Vic.
Threatened species: ROTAP: 3KC-
AVH map***

Text by S. W. L. Jacobs
Taxon concept:

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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