Bromus pacificus |
Bromus secalinus |
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Pacific brome |
brome des seigles, common chess, rye brome |
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Habit | Plants perennial; not rhizomatous. | Plants annual. |
Culms | 60-170 cm, erect; nodes (5)6-8, pubescent; internodes usually glabrous, sometimes pubescent near the nodes. |
20-80 (120) cm, erect. |
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. |
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Panicles | 10-25 cm, open, nodding; branches ascending, spreading, or drooping. |
5-23 cm long, 2.5-12 cm wide, open, nodding; branches spreading to ascending; lower branches slightly drooping, often secund after anthesis, not sinuous. |
Spikelets | 20-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)6-10 florets. |
10-20 mm, shorter than at least some panicle branches, ovoid-lanceolate or ovate, laterally compressed, not purple-tinged; florets 4-9(10), ascending-spreading after flowering, bases visible at maturity; rachilla internodes visible at maturity. |
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. |
scabrous or glabrous; lower glumes 4-6 mm, 3-5-veined; upper glumes 6-7 mm, 7-veined; lemmas 6.5-8.5(10) mm long, 1.7-2.5 mm wide, elliptic, coriaceous, obscurely 7-veined, rounded over the midvein, backs usually glabrous, sometimes pubescent, scabrous to puberulent on the margins and near the apices, margins evenly rounded, inrolled at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm; awns (0)3-6(9.5) mm, straight or flexuous, arising less than 1.5 mm below the lemma apices; anthers 1-2 mm. |
Caryopses | equaling the paleas, thick, strongly inrolled at maturity. |
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Lower | sheaths glabrous or loosely pubescent and glabrate; ligules 2-3 mm, glabrous, obtuse; blades 15-30 cm long, 2-4 mm wide, abaxial surfaces pilose or glabrous, adaxial surfaces pilose. |
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2n | = 28. |
= 28. |
Bromus pacificus |
Bromus secalinus |
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Distribution |
AK; OR; WA; BC
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AK; AL; AR; AZ; CA; CO; CT; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; HI; AB; BC; NB; NS; ON; QC; YT
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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 secalinus is native to Europe. It is widespread in the Flora region, where it grows in fields, on waste ground, and along roadsides. Specimens with pubescent spikelets may be called B. secalinus var. velutinus (Schrad.) W.D.J. Koch. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 218. | FNA vol. 24, p. 230. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromopsis | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromus |
Sibling taxa | ||
Synonyms | Bromopsis pacifica | B. secalinus var. velutinus, B. grossus |
Name authority | Shear | L. |
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