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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 antiquus

HABIT Perennial; caespitose. Butt sheaths purple. Culms erect; 50–65 cm long; 2–3 -noded. Culm-internodes smooth; distally glabrous. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.3–0.5 mm long; lacerate; truncate. Leaf-blades 11–18 cm long; 2–4.5 mm wide. Leaf-blade surface pilose; sparsely hairy; hairy adaxially. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; drooping; bilateral; 10–15 cm long. Rhachis flattened; glabrous on surface; scabrous on margins; ciliate on margins. Spikelet packing broadside to rhachis; lax.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets linear, or lanceolate; laterally compressed; 14–20 mm long; falling entire. Spikelet callus base truncate. Rhachilla internodes 2.5–3 mm long; eventually visible between lemmas; pubescent.

GLUMES Glumes similar; shorter than spikelet. Lower glume lanceolate; 2.5–3 mm long; 0.66 length of upper glume; coriaceous; without keels; 1–3 -veined. Lower glume lateral veins prominent. Lower glume surface asperulous; rough on veins. Lower glume apex acute. Upper glume lanceolate; 3.5–4.5 mm long; 0.5 length of adjacent fertile lemma; coriaceous; without keels; 1–3 -veined. Upper glume lateral veins prominent. Upper glume surface asperulous; rough on veins. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 8 mm long; coriaceous; purple; keeled; keeled above; 5 -veined. Lemma surface puberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn curved; 12–20 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate; adorned above. Palea surface glabrous, or puberulous; hairy on back; hairy above. Palea apex emarginate, or truncate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.5–2 mm long; purple. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India.

NOTES Triticeae. Bor 1997.

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