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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 hybridus

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 70–100 cm long; 5–6 -noded. Leaf-sheaths longer than adjacent culm internode; smooth; glabrous on surface. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 0.5–1 mm long; truncate. Leaf-blades 12–25 cm long; 5–8 mm wide. Leaf-blade surface scabrous; rough adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; drooping; bilateral; 27 cm long. Rhachis flattened; scabrous on margins. Spikelet packing broadside to rhachis; regular; 2 -rowed. Rhachis internodes 10–17 mm long.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 6–8 fertile florets; with diminished florets at the apex. Spikelets laterally compressed; 17–20 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5 mm long; pubescent. Floret callus pubescent. Floret callus hairs 0–1 mm long.

GLUMES Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume lanceolate, or oblong; 6–8 mm long; coriaceous; much thinner on margins; without keels; 3–5 -veined. Lower glume surface scabrous; rough on veins. Lower glume apex acuminate; muticous, or awned; 1 -awned. Lower glume awn 1–2.5 mm long. Upper glume lanceolate, or oblong; 8–9 mm long; coriaceous; with membranous margins; without keels; 5–7 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex acuminate; muticous, or awned; 1 -awned. Upper glume awn 1–2.5 mm long.

FLORETS Fertile lemma lanceolate, or oblong; 10–11 mm long; coriaceous; much thinner on margins; without keel; 5 -veined. Lemma surface pubescent; hairy all along, or above and below. Lemma margins ciliate. Lemma apex awned; 1 -awned. Principal lemma awn straight; 20–30 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels winged; narrowly winged; ciliolate; adorned above. Palea surface pilose; hairy on margins; hairy above. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2 mm long; yellow. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex; apex unappendaged. Hilum linear.

DISTRIBUTION Asia-temperate: China.

NOTES Triticeae. Chen 2001.

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