96 
San Luis Potosi. 
Specimens examined: SAN Lurs Porost (Eschanzier of 1891). 
The few spines, with the very short radials alternating with the very long and 
stout centrals, furnish a striking character, Occasionally one of the centrals is 
wanting, 
2. Cactus acanthophlegmus (Lehm.) Kuntze, Rev. Gen. Pl. 260 (1891). 
Mamillaria acanthophlegma Lehm. Delect. Sem. Hamb, (1833). 
Subglobose with a deeply depressed vertex, or becoming eylindrical, 
3 to 8.5 cm. in diameter: tubercles sharply quadrangular-conical, with 
densely woolly axils: radial spines 15 to 30, white, very slender (bristly) 
and radiant, sometimes coarse capillary, 4 to 7 mm. long, interwoven 
with those of neighboring tubercles and so covering the whole plant; 
central spines 2 to 4, robust and straight, erect or divergent, whitish 
or reddish, black-tipped, 5 to 6.5 mm. long: flowers reddish, 1 to 2 em. 
broad: fruit unknown.—Type unknown. 
From Coahuila and San Luis Potosi to Oaxaca. FI. May. 
Specimens examined: COAHUILA (Poselger of 1856; Pringle 3116 of 
1890): SAN Luis Poros! (Hschanzier of 1891). 
The central spines are quite variable in number and arrangement. In case there 
are two they are vertically placed and are either erect and parallel or widely diverg- 
ent. Even three centrals may occur in the same vertical plane; but more usually 
the three or four centrals are arranged about a center and are widely divergeut. 
The tubercles are apt to persist and to become naked and corky with age. The 
axillary wool and the capillary radials are also apt to be more or less persistent, thus 
giving the whole plant a woolly appearance. 
3. Cactus brandegéei, sp. nov. 
Cylindrical: tubercles sharply quadrangular-conical, 6 to 8 mm. long, 
with densely woolly axils: radial spines about 10, slender and rigid, 
whitish with dusky tips, spreading but not radiant, 7 to 10 mm. long; 
central spines 3 or 4, stouter and slightly longer, erect-spreading (some- 
times slightly curved), reddish-brown below, becoming blackish above: 
flowers small (scarcely longer than the tubercle?): fruit unknown.— 
Type in Herb. Calif. Acad, 
San Jorge, Lower California. FI. April. 
Specimens examined: LOWER CALIFORNIA (Brandegee of 1889, at 
San Jorge). 
The species has somewhat the spine characters of C. palmeri, but the sharply 
quadrangular and longer tubercles with axillary wool free from bristles suggest a 
_ very different affinity. 
4. Cactus densispinus, sp. nov. 
Globose, 7.5 cm. in diameter, simple: tubercles short, with woolly 
axils: radial spines about 25, erect-spreading, slender but rigid, yel- 
low (brownish to black with age), unequal, 8 to 10 mm. long; central 
spines 6, a little longer (10 to 12 mm.) and straight, more rigid and 
darker, black-tipped: seeds obovate, reddish-brown, 1 mm. long.—T ype 
in Herb. Coulter. 
