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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 ravianus

HABIT Perennial; caespitose. Culms 24–70 cm long. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath oral hairs ciliate; 2–3 mm long. Ligule an eciliate membrane. Leaf-blades 5–35 cm long; 2–4 mm wide. Leaf-blade surface pubescent; hairy adaxially. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; unilateral; 15–40 cm long; bearing 15–48 fertile spikelets on each. Rhachis flattened; smooth on surface; glabrous on surface. Spikelet packing broadside to rhachis; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 6–14 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10–25 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.5–1 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 2–4 mm long; 0.5–0.66 length of upper glume; coriaceous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex dentate; 2 -fid. Upper glume lanceolate; 5–6 mm long; 1.5 length of adjacent fertile lemma; coriaceous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex dentate; 2 -fid; awned; 1 -awned. Upper glume awn 1.5–2 mm long.

FLORETS Fertile lemma lanceolate; 3–4 mm long; coriaceous; grey; without keel; 3 -veined. Lemma apex lobed; 4 -fid; with lobes 2 mm long; awned; 3 -awned. Principal lemma awn from a sinus; 4–5 mm long overall. Lateral lemma awns arising on apex of lobes (outer lobes); 3–3.5 mm long. Palea 2.5–3.5 mm long; 2 -veined. Palea keels ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; 0.5–0.75 mm long. Anthers 3; 1.5–2 mm long.

FRUIT Caryopsis with adherent pericarp; oblong; 1.8–2.3 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Eragrostideae. Sunil & Pradeep 2006.

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