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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 calderi

HABIT Perennial. Rhizomes elongated. Culms erect; 50–100 cm long. Culm-internodes hollow. Culm-nodes purple. Leaves mostly basal. Leaf-sheaths glabrous on surface, or puberulous; outer margin glabrous, or hairy. Leaf-sheath auricles falcate; 2–3 mm long. Ligule an eciliate membrane; 0.2–0.8 mm long; truncate. Collar pubescent. Leaf-blades 2–4 mm wide; stiff. Leaf-blade surface scaberulous; rough adaxially; glabrous, or pubescent; sparsely hairy; hairy abaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 6–10 cm long. Rhachis flattened; glabrous on surface, or pubescent on surface; pubescent on margins. Spikelet packing broadside to rhachis. Rhachis internodes linear; 3–12.5 mm long. Rhachis internode tip flat.

Spikelets solitary, or in pairs. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 4–10 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 8.5–18 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent.

GLUMES Glumes collateral; persistent; similar; shorter than spikelet. Lower glume lanceolate; 3.5–12.5 mm long; 1 length of upper glume; coriaceous; without keels; 3(–5) -veined. Lower glume surface pubescent. Lower glume apex acute. Upper glume lanceolate; 3.5–12.5 mm long; 0.6–0.9 length of adjacent fertile lemma; coriaceous; without keels; 3(–5) -veined. Upper glume surface pubescent. Upper glume apex acute.

FLORETS Fertile lemma lanceolate to oblong; 8–10 mm long; coriaceous; 5–7 -veined. Lemma surface villous. Lemma apex acute; muticous, or mucronate, or awned; 1 -awned. Principal lemma awn 1–2 mm long overall. Palea 1 length of lemma. Palea keels ciliolate; with hairs 0.2–0.6 mm long. Palea surface pubescent; hairy on back; hairy all along, or above. Palea apex emarginate, or truncate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION North America: Subarctic.

NOTES Triticeae. Barkworth 2002.

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