2.Cactus acanthophlegmus (Lehm.) Kuntze, Rev. Gen. Pl. 260
(1891).

Mamillaria acanthophlegma Lehm. Delect. Sem. Hamb. (1833)

Subglobose with a deeply depressed vertex, or becoming
cylindrical, 3 to 8.5 cm. in diameter: tubercles sharply
quadrangular-conical, with densely woolly axils: radial spines 15
to 30, white, very slender (bristly) and radiant, sometimes
coarse capillary, 4 to 7 mm. long, interwoven with those of
neighboring tubercles and so covering the whole plant; central
spines 2 to 4, robust and straight, erect or divergent, whitish
or reddish, black-tipped, 5 to 6.5 mm. long: flowers reddish, 1
to 2 cm. broad: fruit unknown. Type unknown.

From Coahuila and San Luis Potosi to Oaxaca. Fl. May.

Specimens examined: Coahuila (Poselger of 1856; Pringle 3116 of
1890): San Luis Potosi (Eschanzier of 1891).

The central spines are quite variable in number and arrangement.
In case there are two they are vertically placed and are either
erect and parallel or widely divergent. Even three centrals may
occur in the same vertical plane; but more usually the three or
four centrals are arranged about a center and are widely
divergent. The tubercles are apt to persist and to become naked
and corky with age. The axillary wool and the capillary radials
are also apt to be more or less persistent, thus giving the whole
plant a woolly appearance.