Mamillaria roseana Brandegee, Zoe, ii. 19 (1891).

Fasciculately branched at base, the stems 30 to 45 cm. long
(sometimes pendent from rocks and as much as 200 cm. long) and
2.5 to 5 cm. in diameter, the whole plant glaucous: tubercles
elongated-conical, ascending, 10 to 12 mm. long, with woolly
axils: radial spines 7 to 10, straight, rigid and sharp, 9 to 15
mm. long, dark reddish when young, becoming ashy, the upper ones
the longer; the solitary central much longer (20 to 30 mm.),
almost black below and with reddish tip, becoming ashy with age,
usually hooked downwards: flowers numerous, 2.5 to 3.5 cm. long,
bright scarlet: fruit obovate to globose, scarlet, 6 to 9 mm. in
diameter, fleshy: seeds black and pitted. Type in Herb. Calif.
Acad.

Apparently common at low elevations throughout southern Lower
California, especially the eastern side.

Specimens examined: Lower California (W. M. Gabb 17 of 1867, near
Loreto; Brandegee of 1889, at San Gregorio; Palmer 139 of 1890,
near La Paz; Palmer 880 of 1890, on Carmen Island; Brandegee 241
of 1890, at Rancho Colorado).

One of the most showy species of Lower California. The plant has
the appearance of a Coryphanth, and is remarkable for its tall
and slender habit, its large central hooks, and its globose
fruit. Since 1867 this species has been in Herb. Engelmann,
fully characterized as above under the very appropriate specific
name longihamatus.