Bromus anomalus, commonly known as nodding brome or the Mexican brome, is a species of perennial grass in the family Poaceae. It can be found in US states such as New Mexico and Texas and also in Canadian provinces such as Alberta, British Columbia, and Saskatchewan.[1]
Bromus anomalus grows in tufts with culms tall. Its leaf sheaths are pilose, but its ligules are hairless. The surfaces of its leaf blades are rough and scabrous, with hairs on both sides. Its inflorescence is an open, lanceolate panicle growing long. The branches of the panicle are wavy and lightly hairy, with the main branches usually drooping. The spikelets on the panicle are solitary. Fertile spikelets have pedicels, with seven to nine florets. At maturity the spikelets break up and disarticulate below each floret. The glumes are shorter than the spikelets. Both upper and lower glumes are lanceolate and glabrous or slightly hairy.[2]
Bromus anomalus can be distinguished from the similar Bromus porteri by the presence of auricles in B. anomalus, as well as the midribs of its culm leaves narrowing below the collar.[3]
Bromus anomalus typically grows in temperate areas. Its native range is through Central America to the southern United States, from Panama up to Arizona and Texas.[4]