Bromus tectorum
Bromus aleutensis
cheat brome, cheat grass, downy brome, downy chess, drooping brome
Aleut brome, Aleutian brome
5-90 cm, erect, slender, puberulent below the panicle.
40-130 cm tall, 3-7 mm thick, often decumbent.
usually densely and softly retrorsely pubescent to pilose, upper sheaths sometimes glabrous;
auricles absent;
ligules 2-3 mm, glabrous, obtuse, lacerate;
blades to 16 cm long, 1-6 mm wide, both surfaces softly hairy.
coarsely striate, pilose, hairs sparse to moderately dense, throats pilose;
auricles rarely present;
ligules 3.5-5 mm, usually glabrous, occasionally pubescent, lacerate;
blades 13-35 cm long, 6-15 mm wide, flat, usually sparsely to moderately pilose on both surfaces, sometimes glabrous.
5-20 cm long, 3-8 cm wide, open, lax, drooping distally, usually 1-sided;
branches 1-4 cm, drooping, usually 1-sided and longer than the spikelets, usually at least 1 branch with 4-8 spikelets.
10-28 cm, erect, open or somewhat contracted;
lower branches to 10 cm, 1-2 per node, stiffly ascending, with (1)2-3 spikelets on the distal 72, sometimes confined to the tips.
10-20 mm, usually shorter than the panicle branches, sides parallel or diverging distally, moderately laterally compressed, often purplish-tinged, not densely crowded, with 4-8 florets.
25-40 mm, elliptic to lanceolate, strongly laterally compressed, with 3-6 florets.
villous, pubescent, or glabrous, margins hyaline;
lower glumes 4-9 mm, 1-veined;
upper glumes 7-13 mm, 3-5-veined;
lemmas 9-12 mm, lanceolate, glabrous or pubescent to pilose, 5-7-veined, rounded over the midvein, margins hyaline, often with some hairs longer than those on the backs, apices acuminate, hyaline, bifid, teeth 0.8-2(3) mm;
awns 10-18 mm, straight, arising 1.5 mm or more below the lemma apices;
anthers 0.5-1 mm.
glabrous or pubescent;
lower glumes 9-13 mm, 3-5-veined;
upper glumes 10-15 mm, 7(9)-veined;
lemmas 12-17 mm, lanceolate, laterally compressed, usually softly pubescent, sometimes glabrous, strongly keeled at least distally, 9(11)-veined, veins conspicuous distally, apices entire or with acute teeth shorter than 1 mm;
awns (3)5-10 mm;
anthers 2.2-4.2 mm.
= 14.
= 56.
Bromus tectorum
Bromus aleutensis
Bromus tectorum is a European species that is well established in the Flora region and other parts of the world. It grows in disturbed sites, such as overgrazed rangelands, fields, sand dunes, road verges, and waste places. In the southwestern United States, Bromus tectorum is considered a good source of spring feed for cattle, at least until the awns mature. It is highly competitive and dominates rapidly after fire, especially in sagebrush areas. The resulting dense, fine fuels permanently shorten the fire-return interval, further hindering reestablishment of native species. It now dominates large areas of the sagebrush ecosystem of the western Flora region.
Specimens with glabrous spikelets have been called Bromus tectorum f. nudus (Klett & Richt.) H. St. John. They occur throughout the range of the species, and are not known to have any other distinguishing characteristics. For this reason, they are not given formal recognition in this treatment.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Bromus aleutensis grows in sand, gravel, and disturbed soil along the Pacific coast, from the Aleutian Islands of Alaska to western Washington, and on some lake shores of central British Columbia. It has also been found further east in Canada and in northern Idaho, always in disturbed sites, such as road edges.
Bromus aleutensis might represent a modified version of B. sitchensis, in which reproduction occurs at a relatively early developmental state in response to the climatic conditions of the Aleutian Islands (Hulten 1968). B. aleutensis is predominantly self-fertilizing, and B. sitchensis is predominantly outcrossing. Anther lengths close to 4.2 mm suggest that at least some plants of B. aleutensis are outcrossing (Hitchcock 1969). Bromus aleutensis intergrades with B. carinatus var. marginatus to the south.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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