This northeastern species occurs across much of the Ohio Valley, especially on lowlands with medium-acid soils, but It appears to be generally rare in Ky. and Tenn. and it is virtually unknown in Mo., Ark., Miss. and Ala. It may be locally frequent along the Redbird Rv. and other Appalachian rivers (Campbell et al. 1993). However, without fruits, there has been some confusion with marilandica, which tends to occur on more dry and base-rich soils. In addition to its distinctive narrow hairy fruits with square segments (W), hebecarpa has somewhat distinctive clavate-obovate (versus more rounded) petiolar glands, and it is usually more hairy in general (F); stems are sparsely villous above (versus glabrous or nearly so). Included here is the particularly hairy var. longipila E.L. Braun, with its type coll. from KNOT (GH).