GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Elymus aristiglumis

HABIT Perennial; culms solitary, or caespitose; clumped loosely. Culms erect; 40–45 cm long; 2 mm diam.; 1–2 -noded; with 0.15–0.25 of their length below uppermost node. Culm-internodes smooth; distally pruinose. Leaf-sheaths 10 cm long; mostly shorter than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 0.2–0.5 mm long; scarious; truncate. Leaf-blades linear, or lanceolate; 6–8 cm long; 4–5 mm wide. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins ciliate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; drooping; bilateral; 6–8 cm long; 8–20 mm wide; bearing 11–14 fertile spikelets on each. Rhachis flattened; scabrous on margins. Spikelet packing broadside to rhachis; crowded; regular; 2 -rowed. Rhachis internodes 3–10 mm long.

Spikelets solitary. Fertile spikelets sessile.

STERILE SPIKELETS Basal sterile spikelets rudimentary; 1 in number.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets laterally compressed; 12–15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–3 mm long; pubescent. Floret callus pubescent. Floret callus hairs 0.2 mm long.

GLUMES Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume lanceolate; 3–4 mm long; coriaceous; without keels; 1–2(–3) -veined. Lower glume surface scabrous; rough on veins. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 3–7 mm long. Upper glume oblong; 3–5 mm long; coriaceous; without keels; 3–5 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 3–7 mm long.

FLORETS Fertile lemma lanceolate to oblong; 10 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; hairy below. Lemma apex awned; 1 -awned. Principal lemma awn reflexed; 20–30 mm long overall. Palea 1 length of lemma; 2 -veined. Palea surface puberulous; hairy on back; hairy above. Palea apex emarginate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2 mm long; purple. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 5 mm long; 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.