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This species is accepted, and its native range is W. Canada to W. & S. Central U.S.A.

[GB]
Morphology General Habit
Perennial; caespitose. Culms erect, or geniculately ascending; robust; 90-125 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane. Leaf-blades 6-15 mm wide. Leaf-blade surface scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; oblong; 12-25 cm long. Primary panicle branches ascending. Panicle branches flexuous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 6-9 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed strongly; 25-40 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes obscured by lemmas.
Fertile
Spikelets comprising 6-9 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed strongly; 25-40 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes obscured by lemmas.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 0.8 length of upper glume; chartaceous; 1-keeled; 3 -veined. Lower glume surface smooth to scabrous. Lower glume apex acuminate. Upper glume lanceolate; 0.7-0.8 length of adjacent fertile lemma; chartaceous; 1-keeled; 5-7 -veined. Upper glume surface smooth to scabrous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile florets imbricate to tip. Fertile lemma oblong; laterally compressed; 8-15 mm long; chartaceous; much thinner on margins; keeled; distinctly keeled; 5-7 -veined. Lemma margins scabrous. Lemma apex awned; 1 -awned. Principal lemma awn subapical; 4-6 mm long overall. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3. Ovary with a fleshy appendage above style insertion; pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; hairy at apex; apex fleshy. Hilum linear.
Distribution
Asia-temperate: Soviet Middle Asia. North America: northwest USA, southwest USA, and south-central USA.
Reference
Bromeae. Gr Texas 1997.

Native to:

Arizona, British Columbia, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Texas, Utah, Washington, Wyoming

Bromus polyanthus Scribn. ex Shear appears in other Kew resources:

First published in Bull. U.S.D.A. (1895-1901) 23: 56 (1900)

Accepted by

  • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

Not accepted by

  • Allred, K.W. (2012). Flora Neomexicana, ed. 2, 1: 1-599. Range Science Herbarium, Las Cruces, New Mexico. [Cited as Bromus carinatus.]

Literature

Kew Backbone Distributions

  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

GrassBase - The Online World Grass Flora
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0