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Rumex bidens R.Br.
Family Polygonaceae
Common name: Mud Dock

Rumex bidens R.Br. APNI*

Description: Perennial; flowering portion of stem ascending, usually unbranched, 20–60 cm long; rooting at nodes.

Basal leaves not developed; lower stem leaves 10–20 cm long, 15–25 mm wide, linear-lanceolate, apex acute, base truncate or broad-cuneate; petiole somewhat shorter than lamina; upper stem leaves similar but smaller.

Flower whorls 8–20-flowered, distant.

Fruiting valves c. 5 mm long, c. 3.5 mm wide, bearing 2 teeth on each side; callosities present as convex lumps not distinct from valves. Fruiting pedicels to twice as long as valves, much thickened, articulate in lowest third.

Photo Jackie Miles

Distribution and occurrence: Known from the far SC and Murray Valley (SWP). Also in Vic, Tas and SA.

An aquatic species, in and beside fresh water. At times regarded as a weed in irrigation channels. Rarely collected.
NSW subdivisions: SC, SWP
Other Australian states: Vic. Tas. S.A.
AVH map***

Rechinger (1984: 113) described R. Xcomaumii from south-eastern S.A., its putative parents being R. bidens and R. brownii.

Text by K. L. Wilson (1990); edited KL Wilson (May 2018)
Taxon concept: Flora of NSW 1 (1990)

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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