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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 jacquemontii

HABIT Perennial; caespitose. Butt sheaths papery (hyaline); pallid (silvery); glossy. Culms erect, or geniculately ascending; 18–32 cm long. Ligule an eciliate membrane. Leaf-blades filiform; conduplicate, or convolute; 3–9 cm long; 1.5–2 mm wide. Leaf-blade surface smooth; glabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 3–6 cm long. Rhachis flattened; smooth on margins. Spikelet packing broadside to rhachis; lax.

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; 16–20 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate, or oblong; 4.5–6.5 mm long; 0.75–0.8 length of upper glume; coriaceous; without keels; 3–5 -veined. Lower glume lateral veins ribbed. Lower glume surface smooth, or scabrous. Lower glume apex acuminate; muticous, or awned; 1 -awned. Lower glume awn 0–1 mm long. Upper glume elliptic, or oblong; 6–8 mm long; 0.75–0.9 length of adjacent fertile lemma; coriaceous; without keels; 3–5 -veined. Upper glume lateral veins ribbed. Upper glume surface smooth, or scabrous. Upper glume apex acuminate; muticous, or awned; 1 -awned. Upper glume awn 0–2 mm long.

FLORETS Fertile lemma elliptic, or oblong; 8–9 mm long; coriaceous; keeled; keeled above; 5 -veined. Lemma surface smooth, or scaberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn curved; reflexed; 15–40 mm long overall. Palea 1 length of lemma. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; elliptic; membranous. Anthers 3; 1.5 mm long. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: western Asia and China. Asia-tropical: India.

NOTES Triticeae. Fl Pak 1993.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.