Coefficient of Conservatism:
Coefficient of Wetness:
R. W. Smith
Deciduous forests, including beech-maple, oak and oak-hickory, northern hemlock-hardwoods; very rarely in strictly coniferous forests; sometimes on rocky or alluvial sites; persistent after clearing. Much more common than O. longistylis, and often in drier sites.
Rarely a plant of O. longistylis with very young flowers will have styles less than 1.5 mm long, but such can be distinguished from O. claytonii by the congested umbellets with broader bractlets in the involucels, as well as generally longer petals and licorice odor.