Flora of North America species comparison

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Bromus carinatus var. marginatus
Photo is of parent taxon

mountain brome
Habit Plants perennial.
Culms

45-120(180) cm tall.
Sheaths

usually sparsely retrorsely pilose throughout, ranging from densely pilose to glabrous, except at the throat, throats always pilose;

auricles sometimes present on the lower leaves;

ligules 1-3.5 mm, sparsely hairy, acute to obtuse, erose or lacerate;

blades 8-25 cm long, 1-12 mm wide, flat or involute, glabrous or sparsely pilose to pubescent on 1 or both surfaces.
Panicles

5-20(30) cm, erect;

lower branches 1-4 per node, erect or ascending.
Spikelets

with 4-9 florets.
Lower glumes

7-11 mm, 3-7(9)-veined;

upper glumes 9-13 mm, 5-9(11)-veined;

lemmas 10-14(17) mm, pubescent on the backs and margins, on the margins only, or glabrous, 7-9-veined;

awns 4-7 mm;

anthers 1-6 mm.
2n

=42.

Bromus carinatus var. marginatus
Distribution
from USDA
[BONAP county map]
Discussion

Bromus carinatus var. marginatus is primarily an inland species and grows on open slopes, grass balds, shrublands, meadows, and open forests, in montane and subalpine zones. It grows from British Columbia to Saskatchewan, south throughout the western United States, and also extends into northern Mexico. Its elevational range is 350-2200 m in the northern part of its distribution, and 1500-3300 m in the south. Bromus carinatus var. marginatus is variable and intergrades with B. carinatus var. carinatus to the west, B. aleutensis to the north, and B. polyanthus to the southeast. As treated here, B. carinatus var. marginatus includes B. luzonensis J. Presl, which has been recognized mainly on the basis of its canescent sheaths and blades; this trait is highly variable and may be environmentally determined. Although the name Bromus carinatus var. marginatus was attributed to Hitchcock by Scoggan, there is no evidence that either A.S. or C.L. Hitchcock actually made the combination.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 24, p. 205.
Parent taxa Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Ceratochloa > Bromus carinatus
Sibling taxa
B. carinatus var. carinatus
Synonyms Ceratochloa marginata, B. sitchensis var. marginatus, B. marginatus var. seminudus, B. marginatus var. latior, B. marginatus, B. luzonensis, B. breviaristatus
Name authority (Nees) Barkworth & Anderton
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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