Bromus pacificus

Shear
Common names: Pacific brome
Endemic
Synonyms: Bromopsis pacifica
Treatment appears in FNA Volume 24. Treatment on page 218.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants perennial; not rhizomatous. Culms 60-170 cm, erect; nodes (5) 6-8, pubescent; internodes usually glabrous, sometimes pubescent near the nodes. Sheaths pilose, midrib of the culm leaves not abruptly narrowed just below the collar; auricles absent; ligules 2-4 mm, glabrous, truncate, erose or lacerate; blades 20-35 (37) mm long, 6-16 mm wide, flat, abaxial surfaces glabrous, adaxial surfaces pilose. Panicles 10-25 cm, open, nodding; branches ascending, spreading, or drooping. Spikelets 20-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4) 6-10 florets. Glumes pubescent; lower glumes 6-8.5 mm, 1 (3) -veined; upper glumes 8-11.5 mm, 3-veined, not mucronate; lemmas 10-12 mm, lanceolate, rounded over the midvein, backs pubescent, margins more densely so, apices acute, entire; awns 3.5-7 mm, straight, arising less than 1.5 mm below the lemma apices; anthers 2-4 mm. 2n = 28.

Distribution

Alaska, Oreg., Wash., B.C.

Discussion

Bromus pacificus grows in moist thickets, openings, and ravines along the Pacific coast from southeastern Alaska to northern California, with a few occurrences further inland.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Bromus pacificus"
membranous +  and scarious +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Leon E. Pavlickf +
1 (?) +  and 3 (?) +
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 +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
not evident +
cross +, linear +  and narrowly lanceolate +
6mm;16mm +
drooping;spreading;drooping;spreading;ascending +
spikelike +
Pacific brome +
not branching +
60 cm600 mm <br />0.6 m <br /> (170 cm1,700 mm <br />1.7 m <br />) +
not woody +
Alaska +, Oreg. +, Wash. +  and B.C. +
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 +
mucronate +  and acute +
unequal +
uncinate +
solid +  and hollow +
pubescent +  and glabrous +
pubescent +  and glabrous +
rounded +  and lanceolate +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
herbaceous +  and coriaceous +
lacerate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
0.6 cm6 mm <br />0.006 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
concealed +  and prominent +
6 +  and 8 +
2 +  and 1 +
hairy +  and glabrous +
well-developed +
reduced +
10 cm100 mm <br />0.1 m <br /> (25 cm250 mm <br />0.25 m <br />) +
dry +  and fleshy +
1 +  and 60 +
not viviparous +
elliptic +  and lanceolate terete +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Bromopsis pacifica +
Bromus pacificus +
Bromus sect. Bromopsis +
species +
membranous +
not mucronate +
0.8 cm8 mm <br />0.008 m <br /> (1.15 cm11.5 mm <br />0.0115 m <br />) +
aquatic +  and terrestrial +