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Descriptions

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

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

Bromus koeieanus

HABIT Perennial; caespitose; clumped densely. Butt sheaths light brown; glabrous. Culms geniculately ascending; 20–35 cm long; 2–3 -noded. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface, or puberulous. Ligule an eciliate membrane; 1–4 mm long; lacerate. Leaf-blades 3–10 cm long; 1–2 mm wide. Leaf-blade surface pubescent; hairy on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; effuse; 5–8 cm long; bearing few spikelets. Primary panicle branches appressed, or ascending; 1–2 -nate; 1.5–4 cm long; bearing 1–2 fertile spikelets on each lower branch. Panicle axis scaberulous. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 12–18 mm long; 3–4.5 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2 mm long.

GLUMES Glumes persistent; shorter than spikelet. Lower glume linear; 5.5 mm long; 0.5–0.66 length of upper glume; membranous; much thinner on margins; without keels; 1–3 -veined. Lower glume lateral veins absent, or distinct. Lower glume apex acuminate. Upper glume lanceolate; 8–12 mm long; 1 length of adjacent fertile lemma; membranous; with hyaline margins; without keels; 3–5 -veined. Upper glume apex acuminate; mucronate.

FLORETS Fertile lemma lanceolate, or oblong; 8–12 mm long; chartaceous; without keel; 7 -veined. Lemma surface puberulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn subapical; 3–4 mm long overall. Palea 1 length of lemma. Palea keels ciliolate; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 4.5–5 mm long. Ovary with a fleshy appendage above style insertion; pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex; apex fleshy. Hilum linear.

DISTRIBUTION Asia-temperate: western Asia.

NOTES Bromeae. Melderis 1994.

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