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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 longearistatus
HABIT Perennial; caespitose. Rhizomes absent, or elongated. Culms erect, or geniculately ascending; 25–70 cm long. Leaf-sheaths pilose. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blades convolute; 5–15 cm long; 2–3 mm wide. Leaf-blade surface pilose; hairy adaxially.
INFLORESCENCE Inflorescence composed of racemes; embraced at base by subtending leaf.
Racemes 1; single; bilateral; 6–15 cm long; bearing few fertile spikelets; bearing 2–3 fertile spikelets on each. Rhachis flattened; pubescent on surface (sparsely); scabrous on margins. Spikelet packing broadside to rhachis. Rhachis internodes oblong; 10–15 mm long.
Spikelets solitary. Fertile spikelets pedicelled, or sessile. Pedicels oblong; 0–1.5 mm long.
FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 20–25 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus glabrous; base truncate. Rhachilla internodes definite; 2–3 mm long.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume elliptic; 4–6 mm long; 0.6–0.8 length of upper glume; coriaceous; without keels; 3–5 -veined. Lower glume primary vein scabrous. Lower glume lateral veins ribbed. Lower glume surface scabrous. Lower glume apex acuminate; muticous, or awned; 1 -awned. Lower glume awn 0–4 mm long. Upper glume elliptic; 6–8 mm long; 0.6–0.8 length of adjacent fertile lemma; coriaceous; without keels; 5–7 -veined. Upper glume lateral veins ribbed. Upper glume surface scabrous. Upper glume apex acuminate; muticous, or awned; 1 -awned. Upper glume awn 0–4 mm long.
FLORETS Fertile lemma oblong; 9–10 mm long; coriaceous; without keel; 5 -veined. Lemma surface puberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn curved; reflexed; 30–40 mm long overall. Palea 2 -veined. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; membranous. Anthers 3; (2.5–)3–3.5 mm long. Stigmas 2; protandrous; laterally exserted. Ovary pubescent on apex.
FRUIT Hilum linear.
DISTRIBUTION Asia-temperate: Soviet Middle Asia, western Asia, and China. Asia-tropical: India.
NOTES Triticeae. Fl Iran.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
