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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 durus

HABIT Perennial; caespitose. Basal innovations extravaginal. Culms erect; 60–90 cm long; 1.6–2.2 mm diam.; 3–4 -noded. Culm-internodes distally pruinose. Leaf-sheaths 15–21 cm long; smooth; glabrous on surface. Ligule an eciliate membrane, or absent; 0.2 mm long. Leaf-blades erect; flat, or involute; 5–15(–30) cm long; 2–5.5 mm wide. Leaf-blade surface scaberulous; rough adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 5–8 cm long. Rhachis smooth on margins, or scaberulous on margins. Spikelet packing broadside to rhachis; 2 -rowed. Rhachis internodes 4–6 mm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–2 mm long.

FERTILE SPIKELETS Spikelets comprising 3–6 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 13–16 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus base truncate. Floret callus pilose.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate, or elliptic; 3–4 mm long; 0.66 length of upper glume; coriaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute, or acuminate. Upper glume lanceolate, or elliptic; 5–6 mm long; 0.5 length of adjacent fertile lemma; coriaceous; without keels; 3 -veined. Upper glume lateral veins prominent. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma lanceolate to oblong; 11 mm long; coriaceous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 25–30 mm long overall. Palea 10 mm long. Palea keels scabrous. Palea surface puberulous. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with adherent pericarp; oblong; 6 mm long; hairy at apex. Hilum linear.

DISTRIBUTION Asia-temperate: China.

NOTES Triticeae. Keng 1996.

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