107 
Specimens examined: LOWER CALIFORNIA (Brandegee of 1889, on 
Magdalena Island), 
The tubercles are so close together that the plant appears thickly covered with 
the unusually stout and erect-spreading straight spines, afew of the centrals being 
specially prominent. The plant is more slender than the ordinary “ cylindrical ” 
members of the genus, but stouter than the slender hooked forms of the preceding 
section. 
26. Cactus rhodanthus (Link & Otto) Kuntze, Rev. Gen. Pl. 261 (1891), 
Mamillaria rhodantha Link & Otto, Icon, t. 26 (1828-31). 
Mawmillaria lanifera Haw, Phil. Mag. Ixiii., 41 ( ), not Salm-Dyck (1850), 
Oblong or subcylindric, 30 em. or more high, 7.5 to 10 em. in diame- 
ter, often forking from the middle: tubercles conical, 12 mm. long, 8 
mm. in diameter, with woolly axils: radial spines 16 to 20, bristle-like, 
white, the lower longer (8 to 10mm.); central spines 6 or 7, rigid, whit- 
ish with black tip, 12 mm. long: flowers rose color, 12 mm.in diameter: 
fruit 2.5 em. long, cylindrical. (ZUl. 1. ¢.)—Type unknown. 
Referred to Mexico in general, but reported as yet from San Luis 
Potosi to southern Mexico. FI. profusely all summer. 
Specimens examined: SAN Luts Povosrt (Bourgeau 47; Pringle 
3679; Eschanzier of 1891): also growing in Mo. Bot. Gard. 1893, 
The specimens of Bourgeau and Pringle have somewhat larger spines than the type, 
as indicated by the description. 
27. Cactus rhodanthus sulphureospinus. 
Mamillaria sulphurea Forst. Handb. Cact, (1846), not Cactus sulphureus Gill. 
(1830). 
Mamillaria rhodantha sulphurea Salin, Hort, Cact. Dyck. 11 (1850). 
Central spines sulphur-yellow; otherwise like the species.—T'ype 
unknown. 
San Luis Potosi. 
Specimens examined: SAN Luis Poros (Pfeiffer, with no number 
or date; Eschanzier of 1891). 
The varietal distinction maintained seems a small one, but it is constant and 
striking, so far as can be discovered. 
28. Cactus capillaris. 
Mamillaria lanifera Salm, Cact. Hort. Dyck. 98 (1850), not Haw. 
Cactus laniferus Kuntze, Rev. Gen. Pl. 250 (1891). 
Cylindrical and erect: tubercles crowded, conical, glaucous, with 
axillary bristles: radial spines capillary and very numerous, white and 
crisped, entirely covering the plant; central spines 4 to 6, rigid, straight 
and spreading, straw-colored, 8 to 12mm. long: flowers equaling the 
tubercles, the yellow petals striped with red: fruit unknown.— Type 
unknown. 
Referred to Mexico in general, but definitely known only from Coa- 
huila. 
Specimens examined: COAHUILA (Palmer of 1880). 
There is a confusion of synonyiy between this species and C. rhodanthus, both 
having been named Mamillaria lanifera. The earlier M. lanifera of Haworth, how- 
