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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 striatus

HABIT Annual. Culms erect; 50–80 cm long; 4 -noded. Culm-internodes distally glabrous, or pubescent. Leaf-sheaths striately veined; pilose; with reflexed hairs. Ligule an eciliate membrane; 2–3 mm long; pubescent on abaxial surface; lacerate; truncate. Leaf-blades 10–15 cm long; 4–8 mm wide. Leaf-blade surface pubescent; sparsely hairy.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; nodding; 10–15 cm long. Primary panicle branches spreading, or drooping; 2 -nate; 2–6 cm long; bearing 1–2 fertile spikelets on each lower branch. Panicle axis scabrous. Panicle branches flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed strongly; 25–30 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 3 mm long; scaberulous.

GLUMES Glumes persistent; shorter than spikelet. Lower glume lanceolate; 10 mm long; 0.75 length of upper glume; membranous; much thinner on margins; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acuminate. Upper glume lanceolate; 14 mm long; 0.9 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 5–7 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 15 mm long; chartaceous; keeled; 7 -veined. Lemma midvein scabrous. Lemma surface smooth, or scaberulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn subapical; 12–18 mm long overall. Palea keels ciliolate. Palea apex with excurrent keel veins. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3. Ovary with a fleshy appendage above style insertion; pubescent on apex.

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

DISTRIBUTION South America: western South America.

NOTES Bromeae. Hithcock 1995.

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