Cylindrical: tubercles crowded, glaucous, cylindrical (somewhat
broadest above), about 4 mm. long, with dense axillary wool
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.