Accepted name: Mammillaria decipiens subsp. camptotricha
Freely clustering, body globular to 7 cm wide. Axils bristly. Central spines typically lacking, 6-8 twisting bristly yellowish radial spines to 27 mm. Flowers white to 20 mm long and 10 mm wide. Fruit green to pale pink.
M. camptotricha var. subinermis is a name of uncertain application used for some forms of M. camptotricha.
M. albescens Tiegel is sometimes regarded as a form of M. camptotricha Sams, differing in the short, straight, white radial spines.
Source: (1997). Cactaceae. In: . Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.