Isotoma tridens (E.Wimm.) Lammers APNI*
Synonyms: Hypsela tridens E.Wimm. APNI*
Description: Prostrate, mat-forming herb rooting at the nodes.
Leaves oblong to elliptical, 1.5–8 mm long, 0.5–3 mm wide, margins toothed or rarely entire, minutely pubescent; petiole very short or absent.
Flowers solitary, pedicels up to 2 cm long. Calyx lobes 0.5–1.5 mm long, densely and minutely pubescent. Corolla 4–9.5 mm long, white, sometimes tinged with mauve, glabrous to sparsely minutely hairy; tube 2–5 mm long; lobes ± equal, 2–5.5 mm long. Filaments to 5 mm long; lower anthers with a short apical bristle. Ovary turbinate.
Fruit indehiscent, ellipsoid to globose, 1.5–3 mm long, crowned by persistent calyx lobes.
Flowering: Flowers November–May.
Distribution and occurrence:
Grows on the edges of lakes, pools and slow-moving streams.
NSW subdivisions: ST, SWS, SWP
Other Australian states: Vic.
Text by Peter G. Wilson
Taxon concept: Lammers (1999)
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.