Bromus laevipes
Bromus arizonicus
chinook brome, narrow flower brome, woodland brome
Arizona brome
50-150 cm, erect or basally decumbent, often rooting from the lower nodes;
nodes 3-5(6), pubescent;
internodes usually glabrous, often puberulent-pubescent just below the nodes, rarely puberulent throughout.
30-90 cm tall, to 3 mm thick, erect.
glabrous, sometimes slightly pubescent near the throat, sometimes with hairs in the auricular position;
auricles absent or vestigial on the basal leaves;
ligules 2-4.2 mm, glabrous, obtuse, lacerate;
blades 13-26 cm long, 4-10 mm wide, light green or glaucous, flat, glabrous, sometimes scabrous on both surfaces.
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, open, nodding;
branches ascending to spreading, often drooping.
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.
23-35 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 5-11 florets.
18-25 mm, elliptic to lanceolate, strongly laterally compressed, with 4-8 florets.
glabrous, sometimes scabrous, margins often bronze-tinged;
lower glumes 6-9 mm, 3-veined;
upper glumes 8-12 mm, 5-veined;
lemmas 12-16 mm, elliptic to lanceolate, rounded over the midvein, backs sparsely pilose, pubescent, or scabrous, margins densely pilose, at least on the lower 1/2, often bronze-tinged, apices acute to obtuse, entire, rarely slightly emarginate, lobes shorter than 1 mm;
awns 4-6 mm, straight, arising less than 1.5 mm below the lemma apices;
anthers 3.5-5 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.
= 14.
= 84.
Bromus laevipes
Bromus arizonicus
Bromus laevipes grows from northern Oregon to southern California. It grows in shaded woodlands and on exposed brushy slopes, at 300-1500 m.
(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.)
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
