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Descriptions

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

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

Tripogon humilis

HABIT Perennial; caespitose; clumped densely. Culms erect; 5–8 cm long. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades filiform; involute; 1.5–6 cm long; 1 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially; pubescent; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; unilateral; 2–14 cm long. Rhachis flattened; glabrous on surface; ciliate on margins. Spikelet packing broadside to rhachis; regular; 2 -rowed.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 3.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2–3 mm long; 0.66–0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 3–4 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 3–3.5 mm long; membranous; without keel; 3 -veined. Lemma midvein without distinctive roughness, or scaberulous. Lemma apex dentate; 2 -fid; with lobes 0.5–0.75 mm long; awned; 3 -awned. Principal lemma awn from a sinus; straight; 1.75–2.5 mm long overall. Lateral lemma awns arising on outer edge of lobes; 0.2–0.7 mm long. Palea 1–1.5 mm long; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 0.5–0.75 mm long; yellow.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China.

NOTES Eragrostideae. Yang 1996.

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