Mammillaria bombycina is a cactus species that forms clusters reaching up to 80 centimeters in height. It has a spherical to club-shaped, globose body that is light green, up to 20 centimeters tall and 6 centimeters in diameter. The plant features tubercles arranged in 11 to 18 spiral series, which are very compact, short, conical to cylindrical, rounded at the tips, measuring about 1.5 centimeters long and 1 centimeter wide, and containing watery juice. The
areoles are initially rounded with little wool but become elongated and bare over time. The axils are densely covered with white wool and bristles, and at the apex, this wool covers the tubercles. The plant has 2 to 4 central spines that are thin, stiff, and range from 0.7 to 2 centimeters in length; these spines are amber to white, with the lowest being the longest. Additionally, it has 30 to 40 thin, rigid, radial spines arranged horizontally in a comb-like pattern, mostly no longer than 1 centimeter. The flowers are small, funnel-shaped, reaching about 1.5 centimeters in size, and are light crimson with darker central stripes. The fruits are whitish to club-shaped, and the seeds are very small and black. File:Mammillaria bombycina at US National Botanic Gardens - September 2011 - Sarah Stierch.jpg|Plant File:Mammillaria bombycina 1zz.jpg|Plant in bloom File:Mammillaria bombycina (13985087436).jpg|Flowers in the spines ==Distribution==