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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Micraira tenuis

HABIT Perennial; mat forming. Culms prostrate; slender; 4–10 cm long; 0.3 mm diam.; rooting from lower nodes. Culm-internodes 0.1 cm long; estriate. Leaves cauline; spiral. Leaf-sheaths 0.5 cm long; longer than adjacent culm internode; narrower than blade at the collar; smooth, or scaberulous. Leaf-sheath oral hairs ciliate. Ligule a ciliate membrane; 0.5–1.3 mm long. Leaf-blades deciduous at the ligule; lanceolate, or elliptic; 6–20 cm long; 0.3 mm wide. Leaf-blade venation comprising 1 vascular bundles. Leaf-blade surface pilose; with simple hairs, or tubercle-based hairs. Leaf-blade margins smooth, or scaberulous. Leaf-blade apex obtuse, or abruptly acute.

INFLORESCENCE Inflorescence a panicle. Peduncle 3–9 cm long.

Panicle open; ovate; 2–3 cm long; 2–4 cm wide. Primary panicle branches 5–10 cm long. Panicle branches eglandular, or glandular; with prominent pulvini.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1.75–4.5 mm long.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 0.75–1 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; reaching apex of florets, or exceeding apex of florets; firmer than fertile lemma. Lower glume oblong, or ovate; 0.75–1 mm long; 1 length of upper glume; membranous; 1-keeled; 1(–3) -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent, or obscure. Lower glume apex emarginate; muticous, or mucronate. Upper glume oblong, or ovate; 0.8–1 mm long; 1–1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1(–3) -veined. Upper glume primary vein smooth, or scaberulous. Upper glume lateral veins absent, or obscure. Upper glume apex emarginate; muticous, or mucronate.

FLORETS Fertile lemma obovate; 0.8 mm long; hyaline; keeled; 1 -veined. Lemma apex emarginate. Palea oblong; hyaline; 2 -veined. Palea apex divided to base; 2 -fid.

FLOWER Lodicules absent. Anthers 2; 0.5–0.75 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 0.3–0.5 mm long; striate, or rugose.

DISTRIBUTION Australasia: Australia.

NOTES Micraireae. Lazarides.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.