Coefficient of Conservatism:
Coefficient of Wetness:
R. W. Smith
Native to southern Europe, this species seems partial to cinders of railroad ballast, but also occurs in gravel pits, newly graded roadsides and clearings, dumps, gravelly shores, and other such disturbed, dry habitats.
The first Michigan collections are from railroad yards at Port Huron, St. Clair Co., in 1901. The lower leaves are frequently opposite. This little linear-leaved annual may be only a few centimeters tall when it flowers, or it may be much taller (close to 0.5 m) and bushy.