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Cyperus betchei (Kuek.) S.T.Blake
Family Cyperaceae
Cyperus betchei (Kuek.) S.T.Blake APNI*

Description: Tufted perennial, with short rhizome.

Culms trigonous to terete, smooth, 35–100 cm high, 1.3–2.7 mm diam. Leaves mostly shorter than culms, often septate-nodulose, 2–6 mm wide.

Inflorescence compound, with 4–7 primary branches to 10 cm long; clusters loose, spicate to subdigitate, hemispherical, 25–65 mm diam.; involucral bracts leaf-like, 2 or 3 much exceeding inflorescence. Spikelets flattened, 4–9 per cluster, 8–43 mm long, 1.2–2 mm wide in side view, 10–45-flowered; rachilla broadly winged; glume spacing 1.6–2.3 mm; spikelet falling as unit, or rachilla persistent. Glumes retuse to obtuse with mucro to 0.2 mm long, with sides 2- or 3-nerved, 2.5–3.4 mm long, yellow to dark golden brown. Stamens 3. Style 3-fid.

Nut trigonous, very narrow-ellipsoid, about as long as glume, 1.9–2.2 mm long, c. 0.4 mm diam., pale yellow-brown.

Photo Karen L Wilson

Photo Karen L Wilson

Flowering: spring–summer.

Distribution and occurrence: Grows in seasonally wet situations, such as stream banks and roadside drains; south to the Pilliga Scrub. Also in Qld.
NSW subdivisions: NWP, NWS
Other Australian states: Qld
AVH map***

Text by K. L. Wilson (1993); edited KL Wilson (Jan 2008)
Taxon concept:

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

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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