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Descriptions

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

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

Helictotrichon yunnanense

HABIT Perennial. Rhizomes short. Culms 60–70 cm long; 3–4 -noded. Culm-nodes pubescent. Leaf-sheaths longer than adjacent culm internode; pilose. Ligule an eciliate membrane, or a ciliolate membrane; 1 mm long. Leaf-blades 15–18 cm long; 5–8 mm wide. Leaf-blade surface scabrous; rough adaxially; pilose; sparsely hairy; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 20–30 cm long; 4–6 cm wide. Primary panicle branches 3–8 -nate; 5–10 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 4 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2 mm long. Floret callus pilose.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate, or oblong; 5 mm long; 0.5 length of upper glume; chartaceous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex setaceously attenuate. Upper glume lanceolate, or oblong; 10 mm long; 1 length of adjacent fertile lemma; chartaceous; with hyaline margins; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma oblong; 10 mm long; 2 mm wide; cartilaginous; much thinner above; without keel; 5 -veined. Lemma apex attenuate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; flexuous; 15 mm long overall. Palea 9 mm long; 2 -veined. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; lanceolate; 1.8 mm long. Anthers 3; 3.5 mm long; yellow. Filaments 1 mm long. Stigmas 2. Ovary pubescent on apex.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Sun & Wang 2005.

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