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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 puberulus

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 60 cm long; 1–1.5 mm diam.; 4–5 -noded; with 0.5 of their length below uppermost node. Culm-nodes glabrous. Leaf-sheaths 8.3–10.6 cm long; mostly shorter than adjacent culm internode; glabrous on surface, or puberulous. Ligule an eciliate membrane; 0.3 mm long; scarious; entire, or erose; truncate. Leaf-blades 15–22 cm long; 5–7 mm wide; glaucous. Leaf-blade surface puberulous; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 8–11 cm long. Rhachis flattened. Spikelet packing broadside to rhachis; regular; 2 -rowed. Rhachis internodes 10(–16) mm long.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets laterally compressed; 12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–2.5 mm long; pubescent. Floret callus pubescent. Floret callus hairs 0.3–0.3 mm long.

GLUMES Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume lanceolate, or oblong; 4.5–6 mm long; coriaceous; without keels; 3–5 -veined. Lower glume apex obtuse; muticous. Upper glume lanceolate, or oblong; 5.5–7 mm long; coriaceous; without keels; 5 -veined. Upper glume apex acute; muticous.

FLORETS Fertile lemma lanceolate; 8.5–9 mm long; coriaceous; without keel; 5 -veined. Lemma surface smooth, or scaberulous. Lemma apex awned; 1 -awned. Principal lemma awn straight; 17–23 mm long overall. Palea 0.9 length of lemma; 2 -veined. Palea keels smooth, or scaberulous; adorned above. Palea apex emarginate, or obtuse. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.4 mm long; yellow. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 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.