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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Agropyron dasyanthum

HABIT Perennial; caespitose. Rhizomes elongated. Culms 40–75 cm long. Leaf-sheaths glabrous on surface. Leaf-sheath auricles absent. Ligule an eciliate membrane; 1–1.5 mm long. Leaf-blades convolute; 10–20 cm long; 2–4 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface puberulous; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; linear; bilateral; 6–15 cm long; 7–18 mm wide. Rhachis glabrous on surface, or pubescent on surface. Spikelet packing broadside to rhachis; lax. Rhachis internodes oblong; 3–10 mm long.

Spikelets spreading, or pectinate; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5–6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 7–12 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; firmer than fertile lemma. Lower glume lanceolate; 5–8 mm long; 1 length of upper glume; coriaceous; 1-keeled; keeled all along; 1 -veined. Lower glume primary vein eciliate, or ciliate. Lower glume lateral veins absent. Lower glume apex acuminate; mucronate. Upper glume lanceolate; 5–8 mm long; 0.75–1 length of adjacent fertile lemma; coriaceous; 1-keeled; keeled all along; 1 -veined. Upper glume primary vein eciliate, or ciliate. Upper glume lateral veins absent. Upper glume apex acuminate; mucronate. Upper glume awn 1–2 mm long.

FLORETS Fertile lemma elliptic; 7–8 mm long; chartaceous; keeled; 5 -veined. Lemma surface pilose. Lemma apex acute. Palea keels eciliate, or ciliate; with 1–3 enations per keel. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 5 mm long. Ovary with a fleshy appendage below style insertion; pubescent on apex.

FRUIT Caryopsis with adherent pericarp; oblong; sulcate on hilar side; hairy at apex; apex fleshy. Embryo 0.2 length of caryopsis. Hilum linear; 1 length of caryopsis. Disseminule comprising a floret.

DISTRIBUTION Europe: eastern.

NOTES Triticeae. Fl Eur 1993.

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