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Descriptions

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

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

Oplismenus flavicomus

HABIT Annual. Culms prostrate; 100 cm long. Culm-internodes distally glabrous. Culm-nodes glabrous. Leaves cauline. Leaf-sheaths striately veined; outer margin hairy. Leaf-sheath oral hairs pubescent. Ligule an eciliate membrane; 0.5 mm long. Leaf-blades lanceolate; 8–12 cm long; 7–20 mm wide; chartaceous. Leaf-blade venation with obscure cross veins. Leaf-blade surface pilose. Leaf-blade margins scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 6–9; borne along a central axis; unilateral; 1–2 cm long. Central inflorescence axis 15–23 cm long; pilose. Rhachis angular; puberulous on surface and pilose on surface. Spikelet packing contiguous.

Spikelets in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster; subequal, or the lower smaller. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 4–6 mm long; falling entire.

GLUMES Glumes dissimilar; shorter than spikelet, or reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.9 length of upper glume; 0.6 length of spikelet; herbaceous; 1-keeled; 5 -veined. Lower glume surface pilose. Lower glume apex acute; awned; 1 -awned. Lower glume awn 4–7 mm long; without vesture (but scaberulous). Upper glume ovate; herbaceous; 1-keeled; 5 -veined. Upper glume surface pilose. Upper glume apex acute; mucronate. Upper glume awn 0.5–1 mm long.

FLORETS Basal sterile florets barren; with palea, or without significant palea. Lemma of lower sterile floret ovate; 1 length of spikelet; membranous; 1-keeled; 7 -veined; pilose (sparsely); hairy above; acute; mucronate. Fertile lemma oblong; dorsally compressed; 5 mm long; coriaceous; shiny; without keel; 5 -veined. Lemma margins involute. Lemma apex acute. Palea involute; coriaceous; without keels.

FLOWER Anthers 3; 1.3–2 mm long.

DISTRIBUTION Africa: western Indian ocean.

NOTES Paniceae. SAR 2002.

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