Coefficient of Conservatism:
Coefficient of Wetness:
Sandy and rocky fields, clearings, and bluffs; thin soil over limestone pavement (Drummond Island); shores and grasslands; disturbed places; very localized northwards.
Not nearly so common as G. bicknellii, and often confused with it. In our area, G. carolinianum seems quite consistently to have a rather compact, rounded inflorescence, giving the impression of a tight umbel, while in G. bicknellii the inflorescence is more diffuse and open. The mericarps in both species are smooth, with long ascending hairs (the longest ca. 1–1.5 mm, and darkish). The seeds in both are weakly reticulate with usually ± elongate cells.