of 1865; Palmer of 1869, 1870; Engelmann of 1880; Pringle of
1884): Utah (Parry of 1874): Sonora (Schott of 1853): also
specimens cultivated in the Mo. Bot. Gard. in 1881.

In all references to the fruit of this species it is described as
"oval and green," except in Ives Report, where Dr. Engelmann
describes its real character as the ordinary fruit of
Eumamillaria. The immature fruit is "oval and green," but with
maturity it becomes clavate and scarlet. The Utah specimens of
Parry show an exceptional character in their 30 to 33 scabrous
radial spines, but otherwise they are quite normal. M.
microcarpa Engelm., Emory's Rep. 156. f. 3, should be dropped as
a synonym of this species, at least as to figure and description.
In all probability C.grahami is one of the forms of the Mexican
C. schelhasii (Pfeiff.). Except that in C. grahami the radial
spines are apt to be more numerous and longer, and the centrals
much darker; and in C. schelhasii the 3 centrals seem to be
always present and sometimes all hooked, the descriptions suggest
no difference. In the absence of authentic specimens of the
latter species, however, and with its fruit and seed entirely
unknown, such a reference of C. grahami must be deferred.

20. Cactus bocasanus (Poselger).

Mamillaria bocasana Poselger, Gart. Zeit. 94 (1853).

Depressed-globose, 2 to 3 cm. high: tubercles 8 mm. long, with
long axillary wool: radial spines 25 to 30, white and capillary,
10 to 25 mm. long; central spines 2 to 4, slender and naked (or
slightly puberulent), the most central one hooked (usually