Aegilops cylindrica is a widespread weed in North America, being particularly troublesome in winter wheat. It usually grows in disturbed sites, such as roadsides, fields, and along railroad tracks. It is native to the Mediterranean region and central Asia, and is adventive in other temperate countries. Its apparent absence from Canada is somewhat remarkable.
Hybrids between Aegilops cylindrica and Triticum aestivum, called xAegilotriticum sancti-andreae (Degen) Soo [p. 266], have been found in various parts of North America. They often have a few functional seeds which, on maturing into reproductive plants, can backcross to either parent. For this reason, A. cylindrica is considered a serious weed in many wheat-growing areas within the Flora region.