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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 duthiei

HABIT Perennial; caespitose. Culms 40–70 cm long; 3–4 -noded. Culm-internodes smooth. Leaf-sheaths glabrous on surface; outer margin hairy. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 0.2–0.4 mm long; truncate. Leaf-blades 10–30 cm long; 1.5–3 mm wide. Leaf-blade surface pilose; sparsely hairy; hairy adaxially. Leaf-blade margins ciliate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 10–18 cm long. Rhachis flattened; scabrous on margins. Spikelet packing broadside to rhachis. Rhachis internodes linear. Rhachis internode tip flat.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 15–20 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2.4–2.8 mm long; pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3.5–5 mm long; 0.5–0.6 length of upper glume; coriaceous; much thinner on margins; without keels; 3–5 -veined. Lower glume surface asperulous; rough on veins. Lower glume apex with a unilateral tooth; acute, or acuminate; muticous, or awned; 1 -awned. Lower glume awn 0–3 mm long. Upper glume lanceolate; 6–9 mm long; 0.6–0.75 length of adjacent fertile lemma; coriaceous; with hyaline margins; without keels; 3–5 -veined. Upper glume surface asperulous; rough on veins. Upper glume hairs 2 mm long. Upper glume apex with a unilateral tooth; acute, or acuminate; muticous, or awned; 1 -awned. Upper glume awn 0–3 mm long.

FLORETS Fertile lemma oblong; 10–12 mm long; coriaceous; 5 -veined. Lemma lateral veins ribbed. Lemma surface puberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn curved; 20–40 mm long overall. Palea 1 length of lemma. Palea keels ciliolate; adorned above. Palea surface puberulous; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2.8–3.2 mm long; yellow. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: India.

NOTES Triticeae. Bor 1994.

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