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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 narayanae

HABIT Perennial; caespitose; clumped densely. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms erect; 10–20 cm long. Culm-nodes glabrous. Leaf-sheaths hirsute. Ligule a ciliolate membrane. Leaf-blades 10–25 cm long; 1.5–2.5 mm wide. Leaf-blade midrib indistinct. Leaf-blade surface hirsute; densely hairy; hairy on both sides.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; unilateral; 6–12 cm long. Rhachis angular; smooth on margins; glabrous on margins. Spikelet packing broadside to rhachis; crowded; regular; 2 -rowed.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 5–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate, or ovate; 3.5 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex with a unilateral tooth; obtuse. Upper glume lanceolate; 5.5 mm long; 1.4 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex emarginate; mucronate.

FLORETS Fertile lemma oblong; 4 mm long; 1.75 mm wide; coriaceous; yellow to light green; without keel; 3 -veined. Lemma apex dentate; 4 -fid; with outer lobes longer; acute; awned; 3 -awned. Principal lemma awn from a sinus; 2.5 mm long overall. Lateral lemma awns arising on apex of lobes; 1 mm long; shorter than principal. Palea 3 mm long; 2 -veined. Palea keels ciliolate; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; 0.25 mm long. Anthers 2; 1 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: India.

NOTES Eragrostideae. Gr Kerala 1997.

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