The chiltepin and related bird peppers, the wild forms of the cultivated species, are known to chileheads, but their variations in pod shape and size are not readily apparent. (fieryfoodscentral.com)
The species C. frutescens and C. pubescens have fewer pod shapes, sizes, and colors than C. annuum, C. chinense and C. baccatum. (fieryfoodscentral.com)