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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Leymus obvipodus
HABIT Perennial. Rhizomes elongated. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms erect, or geniculately ascending; 40–75 cm long; 2–3 mm diam.; 2–3 -noded. Leaves mostly basal. Leaf-sheaths puberulous. Ligule an eciliate membrane; 1–2 mm long; truncate. Leaf-blades involute; 6–18 cm long; 2–4 mm wide; stiff. Leaf-blade surface puberulous; sparsely hairy; hairy on both sides.
INFLORESCENCE Inflorescence composed of racemes. Peduncle pubescent above.
Racemes 1; single; erect; bilateral; 8–18 cm long; 6–8 mm wide. Rhachis flattened; pubescent on surface. Spikelet packing broadside to rhachis. Rhachis internodes 5–50 mm long.
Spikelets solitary, or in pairs. Fertile spikelets pedicelled; 1–2 in the cluster. Pedicels 1–14 mm long; pubescent.
FERTILE SPIKELETS Spikelets comprising 4–8 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 11–18 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5–2 mm long; pubescent.
GLUMES Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume linear, or lanceolate; 5–6.5 mm long; 1 length of upper glume; coriaceous; much thinner on margins; 1-keeled; 1–3 -veined. Lower glume lateral veins absent, or obscure. Lower glume surface smooth to scabrous. Lower glume apex attenuate; awned; 1 -awned. Lower glume awn 2–4 mm long. Upper glume linear, or lanceolate; 6–7.5 mm long; 0.75–0.9 length of adjacent fertile lemma; coriaceous; with membranous margins; 1-keeled; 1–3 -veined. Upper glume lateral veins absent, or obscure. Upper glume surface smooth, or scabrous. Upper glume apex attenuate; awned; 1 -awned. Upper glume awn 2–4 mm long.
FLORETS Fertile lemma lanceolate; 7–10 mm long; chartaceous; shiny; keeled; 5 -veined. Lemma lateral veins obscure. Lemma surface smooth, or scabrous. Lemma margins pubescent. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 1–3 mm long overall. Palea 0.9 length of lemma; 2 -veined; 2-keeled. Palea keels scaberulous. Palea surface glabrous. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Anthers 3; 9 mm long; yellow. Ovary pubescent on apex.
FRUIT Caryopsis with adherent pericarp; 4–9 mm long; hairy at apex.
DISTRIBUTION Asia-temperate: China.
NOTES Triticeae. Fl China 2005.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
