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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 thorelii

HABIT Perennial; caespitose; clumped densely. Butt sheaths persistent and investing base of culm; with dead sheaths fracturing into segments. Culms erect; slender; 30–80 cm long; 1–2 -noded. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs ciliate; 3.5 mm long. Ligule a fringe of hairs. Leaf-blades erect; straight; deciduous at the ligule; filiform; flat, or involute; 8–28 cm long; 0.5–0.8 mm wide. Leaf-blade surface pubescent; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; straight; unilateral; 7.5–50 cm long; bearing 16–35 fertile spikelets on each. Rhachis flattened. Spikelet packing broadside to rhachis; lax; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets sessile. Pedicels reduced to a stump; ciliate.

FERTILE SPIKELETS Spikelets comprising 2–12 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 4.5–12 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear; 1.7–2.5 mm long; 0.5–0.7 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex with a unilateral tooth; acute. Upper glume lanceolate; 3–3.8 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate, or ovate; 2.7–3.2 mm long; membranous; without keel; 3 -veined. Lemma lateral veins extending close to apex. Lemma apex entire, or dentate; 2 -fid; with lobes 0–0.3 mm long; obtuse; awned; 1 -awned. Principal lemma awn apical, or from a sinus; 1–2.2 mm long overall. Palea 3–4 mm long; 2 -veined. Palea keels winged; ciliolate. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 1.2 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Eragrostideae. Veldkamp & Phillips 2003.

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