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Hygrophila polysperma (Roxb.) T.Anderson
Family Acanthaceae
Common name: East Indian hygrophila, Miramar weed, Indian swampweed

Hygrophila polysperma (Roxb.) T.Anderson APNI*

Description: Aquatic perennial herb in freshwater, occasionally prostrate along edges of watercourses.

Leaves oblong-elliptic, opposite with entire margins, 2–6 cm long and 0.5–2 cm wide, sparsely covered with hairs.

Flowers solitary, sessile and axillary; corolla bluish-white to white, tubular with two lips, upper lip 2-lobed, lower lip 3-lobed, 1 cm long; calyx hairy, with 5 lobes; stamens 2.

Capsule 6–7 mm long, lacking hooks; 20–30 tiny flattened-circular seeds .

Flowering: Flowering chiefly in autumn and winter.

Distribution and occurrence: Naturalised occasionally on the North Coast of NSW. Also in Qld. Native to the Americas.
NSW subdivisions: *NC
AVH map***

Weedy. Also known as Hemiadelphis polysperma. Hemiadelphis has only this one species and was split off from Hygrophila because of its 2 stamens and lack of hooks in the capsule but recent work suggests that the species belongs in Hygrophila.

Text by Karen Wilson (21 April 2008)
Taxon concept: Robyn Barker (pers. comm. August 2007)

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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