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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Elymus serotinus
HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 40–50 cm long; 0.5–1.2 mm diam.; 2–3 -noded; with 0.4–0.5 of their length below uppermost node. Culm-internodes smooth; distally glabrous. Leaf-sheaths 7–10 cm long; mostly shorter than adjacent culm internode, or subequal to internodes; pilose; outer margin hairy. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades involute; 9–11(–20) cm long; 1–2 mm wide. Leaf-blade surface smooth, or scaberulous; rough adaxially; glabrous.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 1; single; drooping; bilateral; 6–10 cm long; bearing 5–11 fertile spikelets on each. Rhachis flattened; glabrous on surface; scaberulous on margins. Spikelet packing broadside to rhachis; regular; 2 -rowed. Rhachis internodes 7–15 mm long.
Spikelets solitary. Fertile spikelets sessile.
FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets laterally compressed; 12–13 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2 mm long; pubescent. Floret callus pubescent.
GLUMES Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume lanceolate, or oblong; 5–6 mm long; coriaceous; without keels; 3–5 -veined. Lower glume surface scabrous; rough on veins. Lower glume apex acute, or acuminate; muticous. Upper glume lanceolate, or oblong; 7–8 mm long; coriaceous; without keels; 3–5 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex acute, or acuminate; awned; 1 -awned. Upper glume awn 2–5 mm long.
FLORETS Fertile lemma lanceolate, or oblong; 10 mm long; coriaceous; without keel; 5 -veined. Lemma surface puberulous. Lemma apex awned; 1 -awned. Principal lemma awn reflexed; 25–30 mm long overall. Palea 1 length of lemma; 2 -veined. Palea surface puberulous; hairy on back; hairy above. Palea apex truncate. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; membranous. Anthers 3. 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.
