Bromus porteri |
Bromus sterilis |
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nodding brome, Porter brome, Porter's brome |
barren brome, barren bromegrass, poverty brome, sterile brome |
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Habit | Plants perennial; not rhizomatous. | Plants annual. |
Culms | 30-100 cm, erect; nodes (2)3-4(5), glabrous or pubescent; internodes mostly glabrous, puberulent near the nodes. |
35-100 cm, erect or geniculate near the base, glabrous. |
Sheaths | glabrous or pilose, midrib of the culm leaves not abruptly narrowed just below the collar; auricles absent; ligules to 2.5 mm, glabrous, truncate or obtuse, erose or lacerate; blades (3)10-25(35) cm long, 2-5(6) mm wide, flat, not glaucous, both surfaces usually glabrous, sometimes the adaxial surface pilose. |
densely pubescent; auricles absent; ligules 2-2.5 mm, glabrous, acute, lacerate; blades 4-20 cm long, 1-6 mm wide, pubescent on both surfaces. |
Panicles | 7-20 cm, open, nodding, often 1-sided; branches slender, ascending to spreading, often recurved and flexuous. |
10-20 cm long, 5-12 cm wide, open; branches 2-10 cm, spreading, ascending or drooping, rarely with more than 3 spikelets. |
Spikelets | 12-38 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (3)5-11(13) florets. |
20-35 mm, usually shorter than the panicle branches, sides parallel or diverging distally, moderately laterally compressed, with 5-9 florets. |
Glumes | usually pubescent, rarely glabrous; lower glumes 5-7(9) mm, usually 3-veined, sometimes 1-veined; upper glumes 6-10 mm, 3-veined, not mucronate; lemmas 8-14 mm, elliptic, rounded over the midvein, usually pubescent or pilose, margins often with longer hairs, backs and margins rarely glabrous, apices acute or obtuse to truncate, entire; awns (1)2-3(3.5) mm, straight, arising less than 1.5 mm below the lemma apices; anthers (1)2-3 mm. |
smooth or scabrous, margins hyaline; lower glumes 6-14 mm, 1(3)-veined; upper glumes 10-20 mm, 3(5)-veined; lemmas 14-20 mm, narrowly lanceolate, pubescent or puberulent, 7(9)-veined, rounded over the midvein, margins hyaline, apices acuminate, bifid, teeth 1-3 mm; awns 15-30 mm, straight, arising 1.5 mm or more below the lemma apices; anthers 1-1.4 mm. |
2n | = 14. |
= 14,28. |
Bromus porteri |
Bromus sterilis |
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Distribution |
AZ; CA; CO; ID; MT; ND; NE; NM; NV; SD; TX; UT; WY; MB; SK
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AL; AR; AZ; CA; CO; CT; DC; DE; ID; IL; IN; KY; MA; MD; MI; MO; MS; NC; NJ; NM; NV; NY; OH; OK; OR; PA; RI; TN; TX; UT; VA; WA; WV; HI; BC; ON
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Discussion | Bromus porteri grows in montane meadows, grassy slopes, mesic steppes, forest edges, and open forest habitats, at 500-3500 m. It is found from British Columbia to Manitoba, and south to California, western Texas, and Mexico. It is closely related to B. anomalus, and has often been included in that species. It differs chiefly in its lack of auricles, and in having culm leaves with midribs that are not narrowed just below the collar. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Bromus sterilis is native to Europe, growing from Sweden southward. In the Flora region, it grows in road verges, waste places, fields, and overgrazed rangeland. It is widespread in western and eastern North America, but is mostly absent from the Great Plains and the southeastern states. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 213. | FNA vol. 24, p. 224. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromopsis | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Genea |
Sibling taxa | ||
Synonyms | Bromopsis ported | Anisantha sterilis |
Name authority | (J.M. Coult.) Nash | L |
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