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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 glumacea

HABIT Annual; caespitose. Culms erect, or geniculately ascending; 6–16 cm long. Culm-nodes black. Leaf-sheaths without keel; pubescent; with reflexed hairs. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades 3–6 cm long; 1–2 mm wide. Leaf-blade surface pilose; hairy on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate, or oblong; continuous; 2–5 cm long; 1–1.5 cm wide. Panicle axis glabrous. Panicle branches scabrous.

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

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate, or oblong; 4–5 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acuminate; mucronate. Upper glume lanceolate, or oblong; 4–5 mm long; 2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate; mucronate.

FLORETS Fertile lemma lanceolate, or oblong; 2–2.5 mm long; membranous; shiny; keeled; 5 -veined. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.25–0.4 way up back of lemma; geniculate; 2.5–3 mm long overall; not or scarcely exserted from spikelet; with twisted column. Lateral lemma awns arising on apex of lobes; 1–1.5 mm long; shorter than principal. Palea gaping; linear; 0.66 length of lemma; hyaline. Palea keels scabrous. Palea apex dentate; 2 -fid. Rhachilla extension pilose.

FLOWER Anthers 3; 1.5 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Africa: north. Asia-temperate: western Asia.

NOTES Aveneae. Fl Afr N 1993.

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