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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 montanus

HABIT Perennial; caespitose. Culms erect; 6–33 cm long. Ligule a ciliolate membrane. Leaf-blades filiform; involute; 2.5–15 cm long; 0.5–0.75 mm wide. Leaf-blade surface pilose; sparsely hairy; hairy adaxially. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; erect, or drooping; straight, or flexuous; unilateral; 3–15 cm long. Rhachis angular. Spikelet packing broadside to rhachis; 0.25–0.33 their length apart; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 8.5–15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes villous; hairy below. Floret callus pilose.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear, or lanceolate; 1.3–4.3 mm long; 0.3–0.5 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute, or acuminate. Upper glume linear, or lanceolate; 4.5–8.4 mm long; 1.3–1.6 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume apex caudate, or acuminate.

FLORETS Fertile lemma elliptic; 3.5–5.2 mm long; membranous; black; without keel; 3 -veined. Lemma surface scaberulous. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn from a sinus; flexuous; 4–10 mm long overall. Lateral lemma awns arising on outer edge of lobes; 0.5–1.5 mm long; shorter than principal. Palea 1 length of lemma; 2 -veined. Palea keels wingless; ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 1.4–2 mm long.

FRUIT Caryopsis with adherent pericarp; linear, or oblong; isodiametric; biconvex; 1.4–1.7 mm long.

DISTRIBUTION Africa: northeast tropical and east tropical. Asia-temperate: Arabia.

NOTES Eragrostideae. FTEA.

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