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Descriptions

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

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

Trisetum yunnanense

HABIT Perennial; caespitose. Stolons present. Culms 26–35 cm long; 1.5 mm diam.; 2–3 -noded. Culm-internodes smooth; distally glabrous. Leaf-sheaths 9–14 cm long; pubescent; outer margin hairy. Ligule a ciliolate membrane; 1.5–3 mm long. Leaf-blades 4–10 cm long; 2–3 mm wide. Leaf-blade surface glabrous, or puberulous. Leaf-blade margins ciliate. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 7–9 cm long; 1.5–3 cm wide. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–6 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with diminished florets at the apex. Spikelets oblong, or cuneate; laterally compressed; 6.5–9 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent. Floret callus pubescent. Floret callus hairs 0.8 length of lemma.

GLUMES Glumes persistent; dissimilar; shorter than spikelet; thinner than fertile lemma; gaping. Lower glume lanceolate; 4–5 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate; mucronate. Upper glume elliptic; 5–6.5 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acuminate; mucronate.

FLORETS Fertile lemma lanceolate; 6.5–7 mm long; chartaceous; keeled; 5 -veined. Lemma midvein scaberulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.66 way up back of lemma; curved, or geniculate; 12–16 mm long overall; without a column, or with a straight or slightly twisted column. Palea 6.5 mm long; hyaline. Palea keels scaberulous; adorned above; with 0.66 of their length adorned. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 1.8–2.2 mm long. Ovary pubescent on apex.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Chrtek 2006.

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