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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 curvatus

HABIT Perennial; caespitose. Culms geniculately ascending; 23–50 cm long. Ligule a ciliolate membrane. Leaf-blades curled; filiform; conduplicate, or convolute; 5.5–11 cm long; 1–2 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy; hairy adaxially. Leaf-blade apex acute.

INFLORESCENCE Inflorescence composed of racemes. Peduncle flexuous.

Racemes 1; single; drooping; straight, or arcuate; unilateral; 5–15 cm long. Rhachis angular. Spikelet packing broadside to rhachis; distant (below); regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5–12 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 12–20 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous. Floret callus pilose.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; asymmetrical; 3–4.7 mm long; 0.7–0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse, or acute; muticous, or mucronate. Upper glume oblong; 4.2–6 mm long; 1.1–1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex obtuse, or acute; muticous, or mucronate.

FLORETS Fertile lemma elliptic, or oblong; 3.5–5.2 mm long; membranous; dark green; without keel; 3 -veined. Lemma lateral veins excurrent. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn from a sinus; 3.3–6 mm long overall. Lateral lemma awns arising on outer edge of lobes; 0.2–0.8 mm long; shorter than principal. Palea 1 length of lemma; 2 -veined. Palea keels winged; narrowly winged; ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 2; 0.5–0.75 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid, or oblong; isodiametric; trigonous; 1.8–2 mm long.

DISTRIBUTION Africa: east tropical.

NOTES Eragrostideae. FTEA.

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