Distribution

Small sixweeks grass is native, occurring from southern British Columbia and Montana south to New Mexico and Baja California Norte. It also occurs on the Pacific slope of South America [22,57,105,114].

Distributions of the varieties overlap considerably. Eastwood small sixweeks grass occurs from central Washington south to northern Baja California and western Arizona [67]. Desert small sixweeks grass is distributed from Washington east to western Montana and south to northern Baja California, western Nevada, and southern New Mexico [104,114]. Confusing small sixweeks grass is the least common variety, occurring from south-central Washington to southern California. Pacific small sixweeks grass occurs from Washington east to western Montana and south to Baja California Sur [65,104]. Plants database provides a distributional map of small sixweeks grass and its infrataxa.

The following biogeographic classification systems are a guide to where small sixweeks grass may occur. Except for the West Coast, precise distribution information for small sixweeks grass is limited, and small sixweeks grass may occur in ecosystems and plant communities that are not listed below.