Bromus richardsonii

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Common names: Richardson's brome
Synonyms: Bromposis richardsonii Bromopsis canadensis subsp. ricbardsonii
Treatment appears in FNA Volume 24. Treatment on page 222.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants perennial; not rhizomatous. Culms 50-110 (145) cm, erect to spreading; nodes (3) 4-5 (6), usually glabrous, sometimes pubescent; internodes usually glabrous. Basal sheaths often retrorsely pilose; culm sheaths glabrous, often tufted-pilose near the auricle position, midrib of the culm leaves not abruptly narrowed just below the collar; auricles absent; ligules 0.4-2 mm, glabrous, rounded, erose, ciliolate; blades 10-35 cm long, 3-12 mm wide, flat, glabrous. Panicles 10-20 (25) cm, open, nodding; branches ascending to spreading or drooping, filiform. Spikelets 15-25 (40) mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4) 6-10 (15) florets. Glumes usually glabrous, sometimes pubescent; lower glumes 7.5-12.5 mm, 1 (3) -veined; upper glumes 8.9-11.3 mm, 3-veined, often mucronate; lemmas 9-14 (16) mm, elliptic, rounded over the midvein, margins more or less densely pilose on the lower 1/2 or 3/4, lower lemmas in a spikelet glabrous across the backs, uppermost lemmas with appressed hairs on the backs, apices obtuse, entire; awns (2) 3-5 mm, straight, arising less than 1.5 mm below the lemma apices; anthers 1.6-2.7 mm. 2n = 28.

Discussion

Bromus richardsonii grows in meadows and open woods in the upper montane and subalpine zones, at 2000-4000 m in the southern Rocky Mountains, and at lower elevations northwards. Its range extends from southern Alaska to southern California and northern Baja California, Mexico; it is found as far east as Saskatchewan, South Dakota, and western Texas. Specimens with pubescent nodes and glumes are apparently confined to the southwestern United States.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Bromus richardsonii"
membranous +  and scarious +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
Leon E. Pavlickf +
1 (?) +  and 3 (?) +
2 cm20 mm <br />0.02 m <br /> (?) +
straight +
distinct +
subterminal +  and terminal +
geniculate +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
10 cm100 mm <br />0.1 m <br /> (35 cm350 mm <br />0.35 m <br />) +
not evident +
cross +, linear +  and narrowly lanceolate +
3mm;12mm +
ascending;spreading or drooping +
filiform +
Richardson's brome +
not branching +
erect +  and spreading +
50 cm500 mm <br />0.5 m <br /> (110 cm1,100 mm <br />1.1 m <br />) +
not woody +
Conn. +, Mass. +, N.H. +, N.J. +, N.Y. +, Calif. +, Del. +, N.C. +, Va. +, W.Va. +, Vt. +, D.C +, Wis. +, Colo. +, Kans. +, Nebr. +, Okla. +, Idaho +, Mont. +, Oreg. +, Wash. +, Wyo. +, Pacific Islands (Hawaii) +, N.Mex. +, Utah +, Maine +, R.I. +, Fla. +, Ala. +, Ark. +, Ariz. +, Ga. +, Iowa +, Ill. +, Ind. +, Ky. +, La. +, Md. +, Mich. +, Minn. +, Mo. +, Miss. +, N.Dak. +, Nev. +, Ohio +, Pa. +, S.Dak. +, Tenn. +, Tex. +, Alaska +, S.C. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +  and Yukon +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
6 +  and 10 +
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 +
pubescent +  and glabrous +
rounded +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
herbaceous +  and coriaceous +
ciliolate +  and glabrous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
0.75 cm7.5 mm <br />0.0075 m <br /> (1.25 cm12.5 mm <br />0.0125 m <br />) +
6 (?) +  and 3 (?) +
concealed +  and prominent +
pubescent +  and glabrous +
4 +  and 5 +
2 +  and 1 +
hairy +  and glabrous +
well-developed +
reduced +
25 cm250 mm <br />0.25 m <br /> (?) +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
dry +  and fleshy +
1 +  and 60 +
not viviparous +
elliptic +  and lanceolate terete +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Bromposis richardsonii +  and Bromopsis canadensis subsp. ricbardsonii +
Bromus richardsonii +
Bromus sect. Bromopsis +
species +
membranous +
0.89 cm8.9 mm <br />0.0089 m <br /> (1.13 cm11.3 mm <br />0.0113 m <br />) +
aquatic +  and terrestrial +