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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 stenostachyus

HABIT Perennial; caespitose. Butt sheaths pubescent. Culms slender; 50–60 cm long; 2–3 -noded. Culm-internodes distally pubescent. Ligule an eciliate membrane; 0.2–0.5 mm long; lacerate. Leaf-blades flat, or convolute; 11–17 cm long; 2–4 mm wide. Leaf-blade surface scabrous; rough adaxially; glabrous, or pubescent; hairy abaxially. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence composed of racemes. Peduncle pubescent above.

Racemes 1; single; erect, or drooping; bilateral; 12–15 cm long. Rhachis flattened; scabrous on surface; ciliate on margins. Spikelet packing broadside to rhachis. Rhachis internodes linear. Rhachis internode tip flat.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 15–20 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent. Floret callus evident; acute.

GLUMES Glumes collateral; persistent; similar; shorter than spikelet. Lower glume lanceolate; 7.5–8.5 mm long; 0.8–0.9 length of upper glume; coriaceous; without keels; 3–5 -veined. Lower glume lateral veins prominent. Lower glume surface scabrous; rough on veins. Lower glume apex attenuate; awned; 1 -awned. Lower glume awn 2.5–4 mm long. Upper glume lanceolate; 8–10 mm long; 1 length of adjacent fertile lemma; coriaceous; without keels; 3–5 -veined. Upper glume lateral veins prominent. Upper glume surface scabrous; rough on veins. Upper glume apex attenuate; awned; 1 -awned. Upper glume awn 2.5–4 mm long.

FLORETS Fertile lemma lanceolate; 8–9 mm long; coriaceous; 5 -veined. Lemma lateral veins prominent. Lemma apex acute; awned; 1 -awned. Principal lemma awn straight, or curved; 9.5–20 mm long overall. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 3–3.5 mm long; yellow. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: western Asia.

NOTES Triticeae. Fl Iran 1995.

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