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Descriptions

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

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

Trisetaria nitida

HABIT Annual; culms solitary, or caespitose. Culms erect, or geniculately ascending; 10–30 cm long. Leaf-sheaths without keel; glabrous on surface, or puberulous; outer margin hairy. Ligule an eciliate membrane; 0.5–1 mm long. Leaf-blades 4–8 cm long; 1–3 mm wide. Leaf-blade surface pubescent; hairy on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted, or spiciform; lanceolate, or oblong; continuous; 3–7 cm long; 1–1.5 cm wide. Panicle axis pubescent. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong; pubescent.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate, or oblong; 6 mm long; 0.9 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume surface pubescent. Lower glume apex acuminate; mucronate. Upper glume lanceolate, or oblong; 6.5 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface pilose. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 1.5 mm long.

FLORETS Fertile lemma lanceolate; 6 mm long; membranous; shiny; keeled; 5 -veined. Lemma midvein scaberulous. Lemma margins scaberulous. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.5–0.66 way up back of lemma; geniculate; 10–14 mm long overall; with a straight or slightly twisted column. Lateral lemma awns arising on apex of lobes; 4–6 mm long; shorter than principal. Palea gaping; linear; 1 length of lemma; hyaline. Palea keels scabrous. Palea apex dentate; 2 -fid; muticous, or with excurrent keel veins.

FLOWER Anthers 3; 4 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Africa: north.

NOTES Aveneae. Fl Afr N 1993.

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