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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 subtilissimus

HABIT Perennial; caespitose. Culms erect; 3–23 cm long. Ligule a ciliolate membrane. Leaf-blades filiform; flat, or conduplicate, or involute; 1–11 cm long; 0.5–0.9 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy; hairy adaxially. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; erect; straight, or flexuous; unilateral; 2–11 cm long. Rhachis angular. Spikelet packing broadside to rhachis; 0.66 their length apart; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 7–19 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 4.2–11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear, or lanceolate, or oblong; 0.8–2.2 mm long; 0.5–0.6 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex truncate, or acute, or acuminate; muticous, or mucronate. Upper glume oblong; 1.6–3.8 mm long; 1.4–1.6 length of adjacent fertile lemma; membranous; 1-keeled; 1(–3) -veined. Upper glume apex truncate, or acute, or acuminate.

FLORETS Fertile lemma oblong; 1.1–2.4 mm long; membranous; mid-green and purple; without keel; 3 -veined. Lemma apex dentate; 2–4 -fid; awned; 3 -awned. Principal lemma awn from a sinus; 4–10 mm long overall. Lateral lemma awns arising on outer edge of lobes; 0.1–1.6 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; 0.2–0.5 mm long.

FRUIT Caryopsis with adherent pericarp; lanceolate; isodiametric; plano-convex; 0.8 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.