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Descriptions

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

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

Elymus guidensis

HABIT Perennial; caespitose; clumped densely. Butt sheaths glabrous, or pubescent. Culms erect; 35–50 cm long; 1.5 mm diam.; 2–3 -noded. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades flat, or involute; 8.5–9 cm long; 3 mm wide. Leaf-blade surface pubescent; densely hairy; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes. Peduncle pubescent above.

Racemes 1; single; erect; ovate; bilateral; 3–3.5 cm long; 5 mm wide. Rhachis flattened; pilose on surface. Spikelet packing broadside to rhachis. Rhachis internodes 1.5–2 mm long.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets oblong, or ovate; laterally compressed; 7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–1.2 mm long; pubescent. Floret callus pubescent.

GLUMES Glumes persistent; similar. Lower glume lanceolate; 3–5 mm long; coriaceous; much thinner on margins; without keels; 1(–3) -veined. Lower glume lateral veins absent, or obscure. Lower glume surface hirsute. Lower glume apex acuminate; muticous, or mucronate. Upper glume lanceolate; 4–7 mm long; coriaceous; with membranous margins; without keels; 1(–3) -veined. Upper glume lateral veins absent, or obscure. Upper glume surface hirsute. Upper glume apex acuminate; muticous, or mucronate.

FLORETS Fertile lemma ovate; 7–9 mm long; coriaceous; 5 -veined. Lemma surface pilose. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 1.5–4 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate. Palea surface hirsute; hairy on back. Palea apex emarginate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 3 mm long; yellow.

FRUIT Caryopsis with adherent pericarp; 5 mm long.

DISTRIBUTION Asia-temperate: China.

NOTES Triticeae. Fl China 2005.

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