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 nakaii

HABIT Perennial. Culms erect, or geniculately ascending; 50–100 cm long. Culm-nodes glabrous, or pubescent. Leaf-sheaths glabrous on surface, or pubescent; with reflexed hairs. Ligule an eciliate membrane. Leaf-blades 11–20 cm long; 4–7 mm wide. Leaf-blade surface pilose; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; straight; bilateral; 10–13 cm long. Rhachis flattened. Spikelet packing broadside to rhachis.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 14–16 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar. Lower glume lanceolate; 9–10 mm long; 0.9 length of upper glume; coriaceous; without keels; 3–7 -veined. Lower glume surface scabrous; rough on veins. Lower glume apex acuminate. Upper glume oblong, or ovate; 9.5–11.5 mm long; 1 length of adjacent fertile lemma; coriaceous; without keels; 3–7 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 10 mm long; coriaceous; 5 -veined. Lemma surface pubescent; hairy on veins. Lemma margins pubescent. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn curved; reflexed; 18–22 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels tuberculate. Palea surface puberulous; hairy on back; hairy above. Palea apex emarginate to obtuse. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; yellow.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China.

NOTES Triticeae. Fl China 2005.

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