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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Tripogon bromoides
HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms 20–40 cm long. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths scaberulous; glabrous on surface, or pilose. Leaf-sheath oral hairs bearded. Ligule a ciliolate membrane; 0.2 mm long. Leaf-blades filiform, or linear; flat, or involute; 10–20 cm long; 1–2.5 mm wide; stiff. Leaf-blade surface scaberulous; rough adaxially; glabrous to hirsute. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 1; single; straight, or arcuate; unilateral; 5.5–8 cm long. Rhachis flattened; scaberulous on margins; glabrous on margins, or ciliate on margins. Spikelet packing broadside to rhachis; regular; 2 -rowed.
Spikelets appressed; solitary. Fertile spikelets sessile.
FERTILE SPIKELETS Spikelets comprising 7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 9–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1–1.5 mm long.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3–3.5 mm long; 0.66 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; muticous, or mucronate. Upper glume elliptic; 4.5–5 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein thickened (obtusely). Upper glume lateral veins absent. Upper glume apex entire, or dentate; 2 -fid; acuminate; muticous, or mucronate.
FLORETS Fertile lemma elliptic; 3.5–4 mm long; membranous; without keel; 3 -veined. Lemma apex lobed; 3 -fid; with central lobe bidentate; mucronate, or awned; 1 -awned. Principal lemma awn from a sinus; 0.5–4 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels smooth, or scabrous. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Anthers 3; 1.5 mm long.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION Asia-tropical: India and Indo-China.
NOTES Eragrostideae. Fl Ceyl 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
