containing bristles: radial spines 25 to 30, very slender and
white but rigid, about 5 mm. long, spreading or somewhat radiant,
entangled with those of neighboring tubercles, and so covering
the whole plant; central spines 3 to 5 (usually 4), more robust,
erect or slightly divergent, brownish with darker tip, 7 to 8 mm.
long: flowers small: fruit clavate and scarlet: seeds black and
strongly pitted, 0.5 to 0.8 mm. in diameter. Type, Palmer 921 in
U. S. Nat. Herb.

San Benito Island, off the west coast of lower California.

Specimens examined: Lower California, San Benito Island (Palmer
921 of 1889, reported as Mamillaria Goodrichii).

Very closely allied to C. capillaris of eastern Mexico.

30. Cactus stellatus Willd. Enum. Suppl. 30 (1813).

Cactus pusillus DC. Cat. Hort. Monsp. 184 (1813), not Haw.
(1803).
Mamillaria pusilla DC. Prod. iii. 459 (1828).

A very common West Indian species, apparently differing from the
variety only in the very much fewer (12 to 20) radial spines,
although numerous specimens, both dried and living, were examined
for additional characters. This difference, however, is so
constant and striking that, taken together with the wide
geographical separation, it should stand as varietal.

31. Cactus stellatus texanus (Engelm.).