Common name: Pale Twig-rush
Machaerina acuta (Labill.) J.Kern APNI*
Synonyms: Baumea acuta (Labill.) Palla APNI*
Description: Slender, tufted perennial with long rhizome.
Culms rigid, flat to biconvex, nodeless, ± striate, glabrous, smooth, 15–35 cm high, 0.8–1.5 mm diam. Leaves basal; blade flat to biconvex, shorter than to exceeding culms, 0.7–2.5 mm wide; sheath straw-coloured to pale red-brown, dull.
Inflorescence oblong in outline, narrow, erect, 2–6(-14) cm long, c. 1 cm diam.; lowest involucral bract shorter than to exceeding inflorescence. Spikelets few, 1-flowered, 4.5–6 mm long. Glumes 3 or 4, acute, red-brown, with margins ciliate or glabrous; fertile glumes 4–5 mm long. Anthers 1.3–2.0 mm long, excluding appendage 0.2–0.5 mm long.
Nut obovoid to ellipsoid, 1.5–2.2 mm long, 1.0–1.3 mm diam., irregularly wrinkled to smooth or minutely reticulate or colliculate, minutely hispid at apex, ± shining, red-brown to black.
Distribution and occurrence: Grows in swamps and damp heath on open sandy soils; mainly coastal, extending to Carrai S.F. Grows on the ranges west of Kempsey and to the Budawang Ra.
NSW subdivisions: NC, CC, SC, ST
Other Australian states: Qld Vic. Tas. W.A. S.A.
Text by K. L. Wilson
Taxon concept: Flora of NSW 4 (1993), updated May 2019
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
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