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 grandis

HABIT Perennial; culms solitary, or caespitose. Rhizomes short. Culms erect; 80–100 cm long; 3.5 mm diam.; 5–6 -noded. Culm-internodes smooth; distally glabrous. Leaf-sheaths subequal to internodes, or longer than adjacent culm internode; glabrous on surface. Ligule an eciliate membrane; 1–1.5 mm long; entire, or erose; truncate. Leaf-blades 20–30 cm long; 5–16 mm wide; coriaceous; glaucous. Leaf-blade surface smooth, or scaberulous; rough abaxially. Leaf-blade apex attenuate; simple, or soon splitting (becoming fibrous).

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; erect; bilateral; 20–25 cm long. Rhachis flattened; scabrous on margins. Spikelet packing broadside to rhachis; lax; regular; 2 -rowed. Rhachis internodes 15–20 mm long.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 6–12 fertile florets; with diminished florets at the apex. Spikelets laterally compressed; 20–30 mm long; 3–5 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5–2 mm long; pubescent. Floret callus pubescent. Floret callus hairs 1 mm long.

GLUMES Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume lanceolate, or oblong; 10–15 mm long; coriaceous; of similar consistency on margins, or much thinner on margins; without keels; 5–7 -veined. Lower glume lateral veins prominent. Lower glume surface smooth, or asperulous. Lower glume apex acute; muticous. Upper glume lanceolate, or oblong; 10–15 mm long; coriaceous; with undifferentiated margins, or membranous margins; without keels; 5–7 -veined. Upper glume lateral veins prominent. Upper glume surface smooth, or asperulous. Upper glume apex acute; muticous.

FLORETS Fertile lemma lanceolate; 15 mm long; 2 mm wide; coriaceous; without keel; 5 -veined. Lemma apex acute; mucronate. Palea oblong; 0.66–0.75 length of lemma; 2 -veined. Palea keels smooth. 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; oblong; 8 mm long; dark brown; 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.