In Europe, this species is concentrated in thickets, woodlands and streambanks on damp soils (Tutim et al. 2001). It is closely related to media and pallida (FNA 5, Y), but differs from in its sepals 5-6.5 mm long (versus usually 3-5 mm); stamens 8-10 (versus usually 1-5); seeds 1.1-1.7 mm wide (versus 0.5-1.3 mm), with tubercles usually taller than broad (versus broader than tall), and with apex usually acute (versus obtuse). S. neglecta is usually cross-pollinated (versus both crossed and selfed). It has spread rapidly through North America since the 1980s, but there are still few available records from the Ohio Valley and the midwest (e.g. Y). FNA 5 reported it from Ky., and there may be a coll. from FRAN to be checked (M. Medley & J. Thieret for WKY). K mapped it in BOON and GALL, but sources need to be checked. The species remains unknown in Ohio (A. Cusick, pers. comm.).