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Bolboschoenus caldwellii (V.J.Cook) Sojak
Family Cyperaceae
Bolboschoenus caldwellii (V.J.Cook) Sojak APNI*

Synonyms: Scirpus caldwellii V.J.Cook APNI*

Description: Rhizomatous perennial.

Culms 30–90 (rarely to 120) cm high, 1–3.5 mm diam.

Leaves 2–7 mm wide. Inflorescence a compact head of 3–6 spikelets, or with 1–3 spikelet clusters on branches 1–4 cm long; involucral bracts 4–22 cm long, 1.5–2.5 mm wide. Spikelets 1–2 cm long. Glumes c. 7 mm long (plus mucro c. 2 mm long), yellow-brown. Hypogynous bristles about half as long as nut, usually deciduous. Style 2-fid.

Nut lenticular with concave faces, broad-obovoid, 3.5–4 mm long, 2.5–3 mm diam., straw-coloured to dark golden brown, shining, minutely but obviously reticulate.

Photo Karen L Wilson

Flowering: spring–summer.

Distribution and occurrence: Occasional, in swamps or inland along artesian bore drains; west to 'Thurloo Downs'.
NSW subdivisions: NC, CC, SC, CT, ST, CWS, SWS, NWP, SWP, NFWP, SFWP
Other Australian states: Qld Vic. Tas. W.A. S.A. N.T.
AVH map***

More slender than the other species, usually with leaves ± erect, with a small clustered inflorescence, and the nut broad and always lenticular, with surface minutely but obviously reticulate under a hand lens.

Text by K. L. Wilson
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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