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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 tahelacanus

HABIT Perennial; caespitose; clumped densely. Culms erect, or geniculately ascending; 90–110 cm long; 4–5 -noded. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.4 mm long; truncate. Leaf-blades 15–32 cm long; 5–8 mm wide. Leaf-blade surface scabrous; rough adaxially.

INFLORESCENCE Inflorescence composed of racemes. Peduncle pubescent above.

Racemes 1; single; straight; bilateral; 5–10 cm long; 15 mm wide. Rhachis flattened; puberulous on surface. Spikelet packing broadside to rhachis. Rhachis internodes 4–9 mm long.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 7 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 15–16 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5–2 mm long; pubescent. Floret callus pilose; hairy on the margins.

GLUMES Glumes persistent; similar. Lower glume lanceolate; 7–8 mm long; coriaceous; much thinner on margins; without keels; 3–6 -veined. Lower glume surface pilose. Lower glume apex acuminate; mucronate, or awned; 1 -awned. Lower glume awn 1–2 mm long. Upper glume oblong; 7–8 mm long; coriaceous; with membranous margins; without keels; 3–6 -veined. Upper glume surface pilose. Upper glume apex acuminate; mucronate, or awned; 1 -awned. Upper glume awn 1–2 mm long.

FLORETS Fertile lemma lanceolate, or oblong; 6–9 mm long; coriaceous; 5 -veined. Lemma surface pubescent; hairy above. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 10–15 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate; adorned above. Palea surface puberulous; hairy on back. Palea apex emarginate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 2.5–3 mm long; yellow.

FRUIT Caryopsis with adherent pericarp; 6 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.