Bromus pacificus |
Bromus hallii |
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Pacific brome |
Hall's brome |
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Habit | Plants perennial; not rhizomatous. | Plants perennial; not rhizomatous. |
Culms | 60-170 cm, erect; nodes (5)6-8, pubescent; internodes usually glabrous, sometimes pubescent near the nodes. |
90-150 cm, erect; nodes 1-2(3), pubescent or puberulent; internodes usually puberulent, occasionally glabrous, pilose to densely pubescent below 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. |
densely pubescent to pilose, hairs to 1 mm, collars pilose, hairs to 2 mm; auricles absent; ligules 0.5-2.5 mm long, sparsely to densely pubescent, obtuse, erose; blades 7.5-16.5 cm long, 3-12 mm wide, flat, densely pubescent on both surfaces. |
Panicles | 10-25 cm, open, nodding; branches ascending, spreading, or drooping. |
5-16 cm, open; branches erect, ascending and appressed to slightly spreading. |
Spikelets | 20-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)6-10 florets. |
25-35(45) mm, terete to moderately laterally compressed, with 3-7 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. |
sparsely to densely pubescent; lower glumes 5-8(9) mm, 1(3)-veined; upper glumes (7)8-9 mm, 3-veined, sometimes mucronate; lemmas 10-14 mm, elliptic, rounded over the midvein, backs sparsely to densely pubescent, margins pubescent, apices entire; awns 3.5-7 mm, straight, arising less than 1.5 mm below the lemma apices; anthers 3-6 mm. |
2n | = 28. |
= unknown. |
Bromus pacificus |
Bromus hallii |
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Distribution |
AK; OR; WA; BC
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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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Bromus hallii grows in southern California on dry, open or shaded hillsides, rocky slopes, and in montane pine woods, from 1500-2700 m. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 218. | FNA vol. 24, p. 211. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromopsis | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromopsis |
Sibling taxa | ||
Synonyms | Bromopsis pacifica | B. orcuttianus var. hallii |
Name authority | Shear | (Hitchc.) Saarela & P.M. Peterson |
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