This Mexican annual ("tomatillo") is cultivated for its fruit, and occasional escapes have been recorded across North America. In Ky. there are a few old reports, and some more recent colls. from FAYE (KY), HICK and LIVI (R. Athey; check EKY). Identification and status of these records remains somewhat uncertain. P. philadelphica is closely related to angulata (F, Cr, W), but has larger flowers, often with purple maculations; 2n = 24 (versus 24 and 48 in angulata). Some of the Ky. colls. are probably referable to var. immaculata Waterfall (= P. ixocarpa auct. non Brot. ex Herman).