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Duma horrida (H.Gross) T.M.Schust.
Family Polygonaceae
Duma horrida (H.Gross) T.M.Schust. APNI*

Synonyms: Muehlenbeckia horrida H.Gross APNI*

Description: Depauperate erect low shrub, ± intricate, 30–50 cm high, ± spiny, older stems with pale grey to dull brown, corky bark, rhizomatous.

Leaves crowded on very short lateral branches, eventually shed, linear, 1–5 cm long, ≤ 2 mm wide, apex acute, margins recurved to revolute, papery, sessile.

Flower clusters at separated nodes, flowers subsessile, usually 3–5 per cluster. Perianth in female flowers divided for a third to half of its length, strongly thickened and angular in fruiting stage, in males divided for slightly more than half its length. Anthers 0.8–1.3 mm long.

Achene trigonous, 2.0–2.5 mm long, smooth, brown.


Habitat
Photo Karen L Wilson

Flower
Photo Karen L Wilson

Distribution and occurrence: Inland NSW; also Victoria, South Australia and Western Australia.

Typically in silt in and beside dry inland lakes.
NSW subdivisions: NWP, SWP, SFWP
Other Australian states: Vic. W.A. S.A.
AVH map***

Only subsp. horrida occurs in NSW.

Text by K.L. Wilson (1990; updated Sept 2006; Aug 2012)
Taxon concept: Flora of NSW 1 (1990) as Muehlenbeckia horrida

N.S.W. occurrences are: subsp. horrida

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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