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Cyperus congestus Vahl
Family Cyperaceae
Cyperus congestus Vahl APNI*

Synonyms: Mariscus congestus (Vahl) C.B.Clarke APNI*

Description: Tufted perennial with very short thick rhizome, often apparently annual. Culms triquetrous, smooth, slightly swollen at base, mostly 20–60 cm high, 1–3 mm diam.

Leaves not septate-nodulose, shorter or longer than culms, 2–6 mm broad.

Inflorescence simple or compound with 2–7 branches to 10 cm, or head-like; spikes dense, broad-cylindrical to hemispherical, 1–5 cm diam.; involucral bracts leaf-like, 2 or 3 longer than inflorescence. Spikelets flattened, numerous per spike, 10–28 mm long, 1–2 mm wide in side view, 8–24-flowered; rachilla winged, persistent. Glumes acute, with sides 3- or 4-nerved, c. 4 mm long, red-brown. Stamens 3. Style 3-fid.

Nut trigonous, narrow-obovoid, about half as long as glume, c. 1.5 mm long, c. 0.6 mm diam., dark brown to black.


Habit
Photo John Tann

Flower
Photo John Tann

Fruit
Photo John Tann

Flowering: spring–summer.

Distribution and occurrence: Introduced; Northern Tablelands (around Glen Innes, Gibraltar Range, Inverell, Guyra, Walcha); also from Stockton Beach south along the coast to Berrima and Brogo; now in Canberra, too. Native of South Africa.

A weed of roadsides and damp ground.
NSW subdivisions: *CC, *SC, *NT, *CT, *ST, *NWS
Other Australian states: *Vic. *Tas. *W.A. *S.A.
AVH map***

Text by K. L. Wilson (1993); edited KL Wilson (Aug 2007, Jan 2010, Nov 2012)
Taxon concept: Flora of NSW 4 (1993)


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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