Mammillaria knebeliana

M.knebeliana Boed. in Monatsschr. Deutsch. Kakt. Ges. 4: 52. 1932, with fig.
Stem simple or branching from the base, shortly cylindric;
Tubercles cylindric, with watery sap; axils with 5-8 hair-like white bristles.
Central spines at first 4, later 5-7, acicular, reddish brown, the lowermost porrect, to 15mm. long, hooked.
Radial spines about 20-25, very fine, white, glabrous, horizontally spreading.
Flowers yellow, about 15mm. in diameter.
Fruit clavate, red; seeds reddish brown, pitted.
MEXICO: (San Luis Potosi), Sierra de San Luis Potosi, collected by E. Georgi and sent to Boedeker.
Type not known to have been preserved.
From "The Journal of the Mammillaria Society"  Vol.XI n.3 - June 1971






Mammillaria knebeliana SB 29
SB 29 - S of Ahualulco - San Luis Potosi - Mexico
Referred to Mammillaria bocasana ssp. eschauzieri