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 ircutensis

HABIT Perennial. Culms 100–150 cm long. Ligule an eciliate membrane. Leaf-blades 3–8 mm wide. Leaf-blade surface glabrous, or pilose; hairy on both sides.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; arcuate; bilateral. Rhachis flattened. Spikelet packing broadside to rhachis; lax. Rhachis internodes linear.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 1 length of upper glume; coriaceous; much thinner on margins; without keels; 3–5 -veined. Lower glume surface smooth, or scabrous. Lower glume apex entire, or with a unilateral tooth; setaceously attenuate. Upper glume lanceolate; 0.75 length of adjacent fertile lemma; coriaceous; with membranous margins; without keels; 3–5 -veined. Upper glume surface smooth, or scabrous. Upper glume apex entire, or with a unilateral tooth; setaceously attenuate.

FLORETS Fertile lemma lanceolate; coriaceous; 5 -veined. Lemma surface puberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 5–12 mm long overall; 1 length of lemma. Palea keels scabrous; with 15–30 enations per keel. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 1.8–2.2 mm long.

DISTRIBUTION Asia-temperate: Siberia.

NOTES Triticeae. Fl Siberia 2006.

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