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This species is accepted, and its native range is Alaska to NW. U.S.A.
A specimen from Kew's Herbarium

[GB]
Morphology General Habit
Perennial. Culms 60-150 cm long; without nodal roots, or rooting from lower nodes. Culm-nodes glabrous, or pubescent. Leaves cauline. Leaf-sheaths glabrous on surface, or pubescent. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 2-5 mm long; brown; pubescent on abaxial surface; erose. Leaf-blades 4-10 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially; glabrous, or pubescent; sparsely hairy; hairy adaxially, or on both sides.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; 15-30 cm long; with spikelets clustered towards branch tips. Primary panicle branches spreading, or drooping. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 7-11 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed strongly; 20-30 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 7-11 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed strongly; 20-30 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; shorter than spikelet. Lower glume lanceolate; 6-9 mm long; 0.66-0.9 length of upper glume; membranous; without keels; 1(-3) -veined. Lower glume lateral veins absent, or obscure. Lower glume surface puberulous. Lower glume apex acuminate. Upper glume lanceolate; 9-10 mm long; 0.75 length of adjacent fertile lemma; membranous; without keels; 3(-7) -veined. Upper glume surface puberulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 11-14 mm long; chartaceous; without keel, or keeled; 5-7 -veined. Lemma surface pubescent; hairy all along. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn subapical; 4-11 mm long overall. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 3 mm long; eventually exserted, or retained within floret. 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
North America: Subarctic, western Canada, and northwest USA.
Reference
Bromeae. Fl Pac NW 1994.

Native to:

Alaska, British Columbia, Oregon, Washington

Bromus pacificus Shear appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Shear, C.L. [1703], Oregon K000913847 Unknown type material

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

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

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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