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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 michnoi

HABIT Perennial; caespitose; clumped loosely. Rhizomes elongated. Culms 50–90 cm long. Culm-internodes smooth; distally glabrous. Leaf-sheaths glabrous on surface. Leaf-sheath auricles absent. Ligule an eciliate membrane; 0.5–1 mm long. Leaf-blades 10–20 cm long; 5 mm wide. Leaf-blade surface puberulous; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; oblong, or ovate; bilateral; 2–8 cm long; 10–20 mm wide. Rhachis pubescent on surface. Spikelet packing broadside to rhachis; crowded. Rhachis internodes oblong.

Spikelets pectinate; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 10–15 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; 4–6 mm long; 1 length of upper glume; coriaceous; much thinner on margins; 1-keeled; keeled all along; 1 -veined. Lower glume primary vein eciliate, or ciliate. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 1 mm long. Upper glume lanceolate; 4–6 mm long; 0.75–1 length of adjacent fertile lemma; coriaceous; with scarious margins; 1-keeled; keeled all along; 1 -veined. Upper glume primary vein eciliate, or ciliate. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 1 mm long.

FLORETS Fertile lemma lanceolate; 6–8 mm long; chartaceous; glaucous; keeled; 5 -veined. Lemma surface pilose to villous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 2 mm long overall. Palea 1 length of lemma. Palea keels ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 5–5.5 mm long. Ovary with a fleshy appendage below style insertion; pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex; apex fleshy. Hilum linear. Disseminule comprising a floret.

DISTRIBUTION Asia-temperate: Siberia, China, and Mongolia.

NOTES Triticeae. Fl USSR 1996.

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