This subspecies of karwinskiana often branches dichotomously and may become multiheaded over time. Like the others, it has reddish radial spines turning grayish white as they age. These spines may be highly variable in length.

These subspecies may be distinguished based on the presence or absence of a central spine (nejapensis has none) and the number of radial spines (nejapensis has fewer than the others, 3-5), as well as its geographical origin (nejapensis is from northwest of the town of Nejapa in Oaxaca, southern Mexico).

Reply to this comment