Comments: A. racemosa is found mostly in rich woods, often in ravines (Gleason and Cronquist 1963, Great Plains Flora Association 1986). Variants from this general habitat include calcareous rocky ravines and even calcareous swamps in the Chicago region (Swink and Wilhelm 1994), and "crevices in sandstone and on sandy detritus in the shaded defile of Zion Canyon, at about 1220m" in Utah (Welsh et al. 1993). In Indiana, it typically grows on steep slopes in moist forests (Mike Homoya pers. comm.). It is described from rich, usually moist, beech-maple and hemlock-hardwoods, especially along edges and clearings and below bluffs; less often in oak woods; and conifer (mostly cedar) swamps (Phyllis Higman pers. comm.).