109 
Specimens examined: TEXAS (Bigelow of 1853; Neally of 1892): Coa- 
HUILA (Bigelow of 1853): also growing in Mo. Bot. Gard. 1892 and 
1893. 
The exterior capillary spines cover the whole plant as with a coarse wool. 
32. Cactus pringlei, sp. nov. 
Globose (2), 5 cm. in diameter: tubercles short-conical, about 6 mm. 
long, with very woolly axils: radial spines 18 to 20, setaceous-bristly 
and radiant, 5 to 8 mi. long; central spines 5 to 7 (usually 6), stout 
and horny, more or less recurved, spreading, 20 to 25mm. long; all straw- 
colored, but the centrals darker: flowers deep red (darker, even brown- 
ish, outside), 8 to 10 mm. long: fruit unknown.—Type, Pringle of 1891 
in Herb. Gray. 
San Luis Potosi. 
Specimens examined: Saw Luis Poros (Pringle of 1891). 
Evidently a member of the Chrysacantha group and near C. rhodanthus sulphwreo- 
spinus, but differs in the much shorter tubercles, straw-colored spines, shorter radials, 
much longer centrals, and smaller darker flowers. 
33. Cactus spherotrichus (Lem.) Kuntze, Rev. Gen. Pl. 261 (1891). 
Mamillaria spharotricha Lem. Cact, 33 (1839). 
Depressed-globose: tubercles cylindrical, obtuse, with some axillary 
bristles: radial spines very much crowded, exceedingly numerous, 
radiant, very slender and bristle-like, white; central spines 6 to 10 and 
even more, erect and more rigid: flowers pale reddish: fruitunknown.— 
Type unknown. 
Referred to Mexico in general, but reported only from San Luis 
Potosi. 
Specimens examined: Mexican specimens from Hort. Dyck in 1857; 
from Hort. Pfersdorf in 1869; and growing in Mo. Bot. Gard. 1893 (from 
material sent by Pringle from San Luis Potosi). 
++ The single central spine shorter than the radials (in C. longimamma centrals often 
more than one and somewhat longer). 
34. Cactus gabbii, sp. nov. 
Mamillaria gabbii Engelm MSS. 
Globose, 5 to 10 cm. in diameter, simple: tubercles eylindrical, 
slender, 12 to 14 mm. long, with woolly axils: radial spines about 13, 
5 to 8mm. long, lower ones longer and stouter, especially the lateral 
ones pectinate; the central shorter, straight, and robust: flowers small, 
yellowish-red: fruit unknown.—Type in Herb. Mo, Bot. Gard. 
Among rocks, from San Ignacio to Mission San Fernando, Lower 
California, and “ perhaps farther north in the interior.” 
Specimens examined: LOWER CALIFORNIA (W. M. Gabb19 of 1867). 
35. Cactus spheericus (Dietr.) Kuntze, Rev, Gen. Pl. 261 (1891). 
Mamillaria spherica Dietr. Allg. Gart. Zeit. xxi. 94 (1853). 
Obovate or clavate, 5 cm. or more high, proliferous and at length 
densely cespitose: tubercles elongated-ovate, acutish, 12 to 16 mm. 
