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Descriptions

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

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

Leptochloa simoniana

HABIT Annual; caespitose. Culms erect; 90–140 cm long; 2.5–4 mm diam. Culm-internodes terete, or elliptical in section; hollow; 6–20 cm long; distally glabrous. Culm-nodes glabrous. Leaf-sheaths scaberulous; glabrous on surface, or pilose; with tubercle-based hairs; outer margin glabrous. Ligule an eciliate membrane; 3–4 mm long; erose; truncate. Leaf-blades 20–35 cm long; 3.5–91 mm wide. Leaf-blade surface scabrous; rough on both sides.

INFLORESCENCE Inflorescence composed of racemes.

Racemes numerous; 65–75; borne along a central axis; straight; unilateral; 5–10 cm long. Central inflorescence axis 35–65 cm long. Rhachis semiterete; scabrous on surface; scabrous on margins. Spikelet packing broadside to rhachis; regular; 2 -rowed. Raceme-bases glabrous.

Spikelets solitary. Fertile spikelets sessile. Pedicels 0.5–1 mm long.

FERTILE SPIKELETS Spikelets comprising 3 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 3–3.4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded, or woolly. Floret callus hairs 0.33–0.5 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 1.6–2.1 mm long; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 1.8–2.4 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume margins scabrous. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma ovate; 2.3–2.7 mm long; membranous; keeled; 3 -veined. Lemma midvein pubescent. Lemma surface pubescent; hairy below; hairy on back, or on veins. Lemma margins pubescent. Lemma apex emarginate, or acute; muticous, or mucronate. Palea 0.66 length of lemma; hyaline; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; 0.3–0.4 mm long. Anthers 3; 0.5–0.6 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid, or ovoid; 1.2–1.3 mm long.

DISTRIBUTION Asia-tropical: Papuasia. Australasia: Australia.

NOTES Eragrostideae. Snow 2004.

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