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Cyperus compressus L.
Family Cyperaceae
Cyperus compressus L. APNI*

Description: Tufted annual with reddish roots.

Culms triquetrous, smooth, 5–35 cm high, 1–2 mm diam.

Leaves not septate-nodulose, a little longer to shorter than culms, 1.5–4 mm wide. Inflorescence simple, with 2–8 branches to 12 cm long, occasionally head-like; subdigitate clusters broad-ovoid, to 50 mm long and diam.; involucral bracts leaf-like, 2–5 longer than inflorescence. Spikelets flattened, 3–10 per cluster, 10–30 mm long, 3–5 mm wide in side view, 12–40-flowered; rachilla not or scarcely winged, persistent. Glumes acute, long-mucronate (mucro to 1 mm long), with sides 3- or 4-nerved, 3–4 mm long, whitish to yellow or yellow-brown, with broad green midrib. Stamens 3. Style 3-fid. 3-fid.

Nut trigonous, broad-obovoid, a third to two-fifths as long as glume, 1.3–1.7 mm long, c. 1 mm diam., dark brown to black.

Flowering: summer.

Distribution and occurrence: Grows in disturbed open situations; in the Casino district and near wharves in Sydney. Native of trop. regions (possibly including tropical Australia).
NSW subdivisions: *NC, *CC
Other Australian states: Qld W.A. N.T.
AVH map***

Text by K. L. Wilson (1993); edited KL Wilson (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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