Bromus berteroanus
Bromus arizonicus
Chilean chess
Arizona brome
30-60 cm, slender.
30-90 cm tall, to 3 mm thick, erect.
pilose-pubescent to nearly glabrous;
blades 7-28 cm long, 2-9 mm wide, pilose or glabrous.
retrorsely pilose, sometimes mostly glabrous, throats sometimes with hairs;
auricles absent;
ligules 1-4 mm, usually glabrous, obtuse, erose;
blades 8-18 cm long, 3-9 mm wide, flat, sparsely pilose on both surfaces or the abaxial surfaces glabrous.
10-20 cm long, 3-9 cm wide, erect, dense;
branches appressed to spreading, sometimes flexuous.
12-25 cm, somewhat contracted or open;
lower branches shorter than 10 cm, 2-3(5) per node, initially erect to ascending, spreading at maturity, with 1-2 spikelets variously distributed.
15-20 mm, elliptic to lanceolate, more or less terete, with 3-9 florets.
18-25 mm, elliptic to lanceolate, strongly laterally compressed, with 4-8 florets.
glabrous, acuminate;
lower glumes 8-10 mm, 1-veined;
upper glumes 12-16 mm, 3(5)-veined;
lemmas 11-14 mm, lanceolate to linear-lanceolate, sparsely pubescent, 5-veined, rounded over the midvein, apices acuminate, bifid, teeth 2-3 mm, usually aristate, sometimes acuminate;
awns 13-20 mm, geniculate, strongly to moderately twisted in the basal portion, arising 1.5 mm or more below the lemma apices;
anthers 2-2.5 mm.
subequal, smooth or scabrous;
lower glumes 8-12.5 mm, 3-veined;
upper glumes 9.5-14 mm, 7-veined, about as long as the lowest lemma;
lemmas 9.5-14 mm, lanceolate, laterally compressed, prominently 7-veined, strongly keeled at least distally, glabrous or pubescent distally or throughout, marginal hairs, if present, longer than those elsewhere, apices entire or with acute teeth shorter than 1 mm;
awns 6-13 mm, sometimes slightly geniculate;
anthers 0.4-0.5 mm.
= unknown.
= 84.
Bromus berteroanus
Bromus arizonicus
Bromus berteroanus is from Chile, and can now be found in dry areas in western North America, including British Columbia, Montana, California, Nevada, Arizona, southwestern Utah, and Baja California, Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Bromus arizonicus grows in dry, open areas and disturbed ground of the southwest, usually below 2000 m. Its range extends from California and southern Nevada into Arizona, New Mexico, and northern Mexico.
Stebbins et al. (1944) demonstrated that, like Bromus carinatus var. carinatus, B. arizonicus obtained three of its genomes from B. catharticus or a close relative, but the remaining three genomes are not homologous with those in B. carinatus, probably being derived from a species in a section other than Ceratochloa. The small anthers of B. arizonicus strongly suggest that most seed is produced by selfing.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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