Mamillaria arizonica Engelm Bot. Calif. i. 244 (1876).
A robust globose or ovate simple form (7.5 to 10 cm. in
diameter), with long (12 to 25 mm.) deeply-grooved tubercles, 15
to 20 long (10 to 30 mm.) rigid whitish radial spines, and 3 to 6
centrals deep brown above. Type, the specimens of Cous, Palmer,
Bischoff and Johnson, all in Herb. Mo. Bot. Gard.
Sandy and rocky soil from southern Utah through northern and
western Arizona to southern California.
Specimens examined: Arizona (Cous of 1865; Cous & Palmer of 1865
and 1872; Palmer of 1869; Bischoff of 1871; Miller of 1881; Rusby
617 of 1853; Pringle of 1884): Utah (Johnson of 1871, 1872, 1874;
Parry of 1875, 1877): California (Parish of 1880): also specimens
cultivated in Mo. Bot. Gard. in 1881; and in Meehan's Gard. in
1882.