Fimbristylis tristachya R.Br. APNI*
Description: Glabrous tufted perennial with short rhizome.
Culms grooved, angular, compressed, to 65(-100) cm high, 1–1.5 mm diam.
Leaves about half as long as culms, 0.5–1.5 mm wide; ligule a dense fringe of short hairs. Inflorescence simple, with 3–7 (rarely 1 or as many as 11) solitary spikelets, on branches to 4 cm long; involucral bracts leaf-like, 1 or 2, erect, to 3 cm long (usually much shorter). Spikelets ovoid to ovoid-lanceolate, terete, acute, (6-)10–25 mm long, 4–6 mm diam. Glumes spiral, papery, obtuse, mucronulate, scarcely keeled, faintly many-nerved, 4–6 mm long, 3–4.5 mm wide, orange-brown. Stamens 3; anthers 1.5–2.5 mm long. Style 2-fid, long-ciliate above.
Nut biconvex, obovoid, distinctly stipitate, 1.1–1.8 mm long, 0.7–1.3 mm diam., smooth, obscurely reticulate by the minutely isodiametric epidermal cells, straw-coloured to mid-brown.
Distribution and occurrence: Grows near creeks and in tall forest; north from Grafton area.
NSW subdivisions: NC
Other Australian states: Qld N.T.
Text by K. L. Wilson
Taxon concept: Flora of NSW 4 (1993)
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