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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 alienus
HABIT Perennial; caespitose; clumped loosely. Rhizomes short. Culms erect; 30–90 cm long; 3–6 -noded. Leaf-sheaths glabrous on surface, or pubescent; with reflexed hairs. Ligule an eciliate membrane. Leaf-blades 12–20 cm long; 4–9 mm wide. Leaf-blade surface pubescent; hairy adaxially.
INFLORESCENCE Inflorescence composed of racemes. Peduncle 23–35 cm long.
Racemes 1; single; straight, or arcuate; bilateral; 7–15 cm long. Rhachis flattened. Spikelet packing broadside to rhachis.
Spikelets solitary. Fertile spikelets sessile.
FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 14–17 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–2.5 mm long; pubescent. Floret callus pubescent. Floret callus hairs 0.4–0.6 mm long.
GLUMES Glumes persistent; similar. Lower glume lanceolate; 7–8 mm long; coriaceous; without keels; 3–6 -veined. Lower glume surface smooth, or scabrous; rough on veins. Lower glume apex acute, or acuminate. Upper glume lanceolate; 8–10 mm long; coriaceous; without keels; 3–6 -veined. Upper glume surface smooth, or scabrous; rough on veins. Upper glume apex acute, or acuminate.
FLORETS Fertile lemma lanceolate; 9–10 mm long; coriaceous; 5 -veined. Lemma surface scabrous; rough on veins. Lemma margins scabrous. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn straight, or curved; 10–25 mm long overall. Palea 0.9 length of lemma; 2 -veined. Palea keels ciliate; adorned above. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Anthers 3; 2.5 mm long; 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.