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Descriptions

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

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

Triraphis pumilio

HABIT Annual; caespitose. Culms geniculately ascending, or decumbent; 3–25 cm long. Leaf-sheaths pilose; with tubercle-based hairs. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades convolute; 3–8 cm long; 1–3 mm wide. Leaf-blade surface scabrous. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle; exserted, or embraced at base by subtending leaf.

Panicle spiciform, or glomerate; oblong, or ovate; 0.6–8 cm long; 0.4–2 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–11 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 4–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose; hairy at tip. Floret callus evident; pubescent; obtuse; disarticulating obliquely.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 1.5–2.5 mm long; 0.7–0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex dentate; 2 -fid; mucronate. Upper glume lanceolate; 2–3 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex dentate; 2 -fid; mucronate.

FLORETS Fertile lemma oblong; 2–3 mm long; membranous; keeled; 3 -veined. Lemma surface pilose. Lemma margins ciliate. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn from a sinus; 1.5–2.5 mm long overall. Lateral lemma awns arising on margin of lemma; ascending; 0.5–1 mm long. Palea 2 -veined. Palea keels scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; fleshy. Anthers 3; 0.35 mm long.

FRUIT Caryopsis with adherent pericarp; 1.2–1.8 mm long.

DISTRIBUTION Africa: north, west tropical, northeast tropical, southern tropical, and south. Asia-temperate: Arabia.

NOTES Eragrostideae. Fl Afr N.

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