Coefficient of Conservatism:
Coefficient of Wetness:
Dry sandy or rocky open forests and savannas with such associates as oak, hickory, pine, aspen, sassafras, bracken, sweet-fern; does well after disturbance such as fire or logging, and characteristic of clearings, old fields, shores, roadsides, railroads, fencerows and borders of forests, occasionally sandy prairies.
Variable in several characters, including pubescence and shape of sepals. The mature corolla usually runs about 3 times as long as the calyx, although it is relatively shorter in plants with unusually long narrow calyx lobes. The flowers at maturity are ± pendent or spreading, and in well-developed plants occur in both terminal and axillary cymes.
Plants intermediate with A. cannabinum in corolla length and color, leaf shape and aspect, flower position, and field appearance are presumably hybrids (A. ×floribundum Greene). Other intermediate plants combine small flowers (as in A. cannabinum) with spreading habit and axillary cymes (as in A. androsaemifolium). Some introgression with the parent species doubtless occurs, making herbarium specimens of the hybrid especially difficult to recognize.