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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Tribolium pleuropogon

HABIT Perennial; mat forming. Stolons present. Culms erect, or geniculately ascending; 12–25 cm long; 2–4 -noded. Leaf-sheath oral hairs scanty. Ligule a fringe of hairs; 0.2 mm long. Leaf-blades filiform; involute; 3–8 cm long; 0.5 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; oblong; 1.5–8 cm long; 0.5–0.8 cm wide.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; 0.5–1 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 3–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; 0.3–0.5 mm long. Floret callus pubescent; obtuse.

GLUMES Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture; gaping. Lower glume ovate; 3–4 mm long; 1 length of upper glume; membranous; without keels; 3 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins ribbed. Lower glume apex acute. Upper glume ovate; 3–4 mm long; 1.2–1.4 length of adjacent fertile lemma; membranous; without keels; 5 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins ribbed. Upper glume apex acute.

FLORETS Fertile lemma ovate; 2.6–2.8 mm long; membranous; much thinner above; much thinner on margins; without keel; 9 -veined. Lemma surface glabrous. Lemma margins ciliate; hairy below. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; 1–1.5 mm long overall. Palea 2 -veined. Palea keels ciliolate. Palea surface pubescent; hairy on flanks (below). Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; fleshy; ciliate. Anthers 3; 0.6–0.8 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; obovoid; concavo-convex; 0.8–1 mm long. Embryo 0.33 length of caryopsis. Hilum elliptic.

DISTRIBUTION Africa: south.

NOTES Arundineae. Conert.

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