Bromus aleutensis, commonly known as the Aleutian brome, is a perennial grass found in North America. B. aleutensis has a diploid number of 56.
It has been suggested that Bromus aleutensis may be a modified version of the similar Bromus sitchensis in which reproduction occurs at an earlier developmental state as a response to the climate of the Aleutian Islands. In addition, while B. aleutensis is mostly self-fertilizing and B. sitchensis is mostly outcrossing, anther lengths close to 4.2mm in some individuals of B. aleutensis suggests outcrossing.
B aleutensis is a perennial grass that is loosely cespitose. The decumbent culms are NaNcm (-2,147,483,648inches) tall and NaNmm thick. The striate and pilose leaf sheaths have dense hairs. Auricles are rarely present. The glabrous ligules are NaNmm long. The somewhat pilose leaf blades are NaNcm (-2,147,483,648inches) long and NaNmm wide. The open panicles are NaNcm (-2,147,483,648inches) long. Lower branches of the inflorescence are 10cm (00inches) long and number one to two per node, with two to three spikelets on their distal half. The elliptic to lanceolate spikelets are NaNmm long, with three to six florets. The glumes are glabrous or pubescent, with the three- to five-veined lower glumes being NaNmm and the seven- to nine-veined upper glumes being NaNmm. The lanceolate lemmas are NaNmm and are laterally compressed and softly pubescent. The lemmas have nine to eleven veins, with the veins being especially conspicuous distally. The awns are NaNmm and the anthers are NaNmm.[1]
Bromus aleutensis grows in sand, gravel, and disturbed soil in the Pacific coast, particularly from the Aleutian Islands (as its specific epithet indicates) to western Washington, though it has been found farther east in lake shores or road edges of Canada and Idaho.[1] [2]
Bromus aleutensis is infected by Fusarium nivale and Hendersonia culmicola.[3]