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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 cacuminus

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 25–57 cm long; 2–4 -noded. Leaf-sheaths pilose. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 0.5 mm long. Leaf-blades involute; 2–15 cm long; 1–6 mm wide; light green, or purple. Leaf-blade surface scabrous; rough abaxially; pubescent; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; drooping; bilateral; 4–13 cm long; 8–12 mm wide. Rhachis flattened; scabrous on surface; scabrous on margins. Spikelet packing broadside to rhachis; contiguous, or lax.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–6 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 25–40 mm long; 2.5–4.5 mm wide; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar. Lower glume lanceolate; 2–6 mm long; 0.7–0.8 length of upper glume; coriaceous; much thinner on margins; without keels; 1–5 -veined. Lower glume lateral veins absent, or distinct. Lower glume surface scabrous; rough on veins. Lower glume apex acuminate; mucronate. Upper glume lanceolate; 2.5–9 mm long; 0.3–0.8 length of adjacent fertile lemma; coriaceous; with membranous margins; without keels; 3–7 -veined. Upper glume surface scabrous; rough below. Upper glume apex acuminate; mucronate.

FLORETS Fertile lemma lanceolate, or elliptic; 8–11 mm long; 1.2–2 mm wide; coriaceous; 5 -veined. Lemma surface scabrous; glabrous, or pubescent. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn curved; 15–30 mm long overall. Palea 0.9 length of lemma; 2 -veined. Palea keels ciliate. Palea surface glabrous, or puberulous; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 1.3–2 mm long; yellow, or purple.

DISTRIBUTION Asia-temperate: China.

NOTES Triticeae. Fl China 2005.

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