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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 zhui

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 25–30 cm long; 4 -noded. Leaf-sheaths longer than adjacent culm internode; glabrous on surface. Ligule an eciliate membrane; 0.2–0.5 mm long. Leaf-blades conduplicate, or involute; 8–10 cm long; 2–4 mm wide. Leaf-blade surface pubescent; hairy on both sides.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; erect; bilateral; 8–9 cm long. Rhachis flattened; scabrous on margins. Spikelet packing broadside to rhachis; regular; 2 -rowed. Rhachis internodes 4–7 mm long.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets laterally compressed; 10–12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–1.5 mm long; pubescent. Floret callus pubescent.

GLUMES Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume lanceolate, or oblong; 5–7 mm long; coriaceous; without keels; 3–6 -veined. Lower glume surface scabrous; rough on veins. Lower glume apex entire, or with a unilateral tooth; acute; muticous. Upper glume lanceolate, or oblong; 6–8 mm long; coriaceous; without keels; 3–6 -veined. Upper glume lateral veins prominent. Upper glume surface scabrous; rough on veins. Upper glume apex entire, or with a unilateral tooth; acute; muticous.

FLORETS Fertile lemma lanceolate; 8.5 mm long; coriaceous; without keel; 5 -veined. Lemma surface puberulous; hairy all along. Lemma apex awned; 1 -awned. Principal lemma awn reflexed; 12 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate; adorned above. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.5 mm long. 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.