Bromus carinatus var. marginatus

(Nees) Barkworth & Anderton
Common names: Mountain brome
Synonyms: Ceratochloa marginata Bromus sitchensis var. marginatus Bromus marginatus var. seminudus Bromus marginatus var. latior Bromus marginatus Bromus luzonensis Bromus breviaristatus
Treatment appears in FNA Volume 24. Treatment on page 205.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

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.

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.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

membranous +  and scarious +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
with acute teeth +  and entire +
Leon E. Pavlickf +
(Nees) Barkworth & Anderton +
divaricate +
1 (?) +  and 3 (?) +
straight +
distinct +
subterminal +  and terminal +
geniculate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
8 cm80 mm <br />0.08 m <br /> (25 cm250 mm <br />0.25 m <br />) +
not evident +
sparsely pilose +  and pubescent +
involute +  and flat +
1mm;12mm +
drooping;reflexed;usually ascending;spreading +
spikelike +
Mountain brome +
not branching +
45 cm450 mm <br />0.45 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
5 cm50 mm <br />0.05 m <br /> (190 cm1,900 mm <br />1.9 m <br />) +
not woody +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
N.Mex. +, Wash. +, Alaska +, Alta. +, B.C. +, Ont. +, Yukon +, Colo. +, Kans. +, Calif. +  and Oreg. +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
4 +  and 9 +
terete +  and laterally compressed +
1-9(11)-veined +
always shorter +  and usually shorter +
lanceolate +
subtending +
pubescent +  and glabrous +
mucronate +  and acute +
unequal +
uncinate +
solid +  and hollow +
glabrous +  and pubescent +
keeled +, compressed +  and lanceolate +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
herbaceous +  and coriaceous +
lacerate +, acute +  and obtuse +
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
ascending +  and erect +
10 cm100 mm <br />0.1 m <br /> (?) +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
concealed +  and prominent +
2 +  and 1 +
hairy +  and glabrous +
well-developed +
reduced +
30 cm300 mm <br />0.3 m <br /> (?) +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
dry +  and fleshy +
overlapping +, not crowded +  and distributed +
not viviparous +
compressed +, elliptic +  and lanceolate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Ceratochloa marginata +, Bromus sitchensis var. marginatus +, Bromus marginatus var. seminudus +, Bromus marginatus var. latior +, Bromus marginatus +, Bromus luzonensis +  and Bromus breviaristatus +
Bromus carinatus var. marginatus +
Bromus carinatus +
variety +
pilose +, densely pilose +  and glabrous +
membranous +
1 cm10 mm <br />0.01 m <br /> (?) +
0.9 cm9 mm <br />0.009 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
aquatic +  and terrestrial +