130 THE CACTACEAE. 
Type locality: Near Viesca, in Coahuila, Mexico. 
Distribution: Coahuila, Mexico. 
Illustration: Monatsschr. Kakteenk. 16: 40, as Mammillaria lenta. 
Figure 137 is from a photograph obtained from L. Quehl in 1921; figure 140 is from a 
photograph of a fruiting plant sent from Parras, Mexico, by C. A. Purpus in 1905. 
> 90. Neomammillaria candida (Scheidweiler). 
2 Mammillaria candida Scheidweiler, Bull. Acad. Sci. Brux. 5: 496. 1838. 
Mammillaria sphaerotricha Lemaire, Cact. Gen. Nov. Sp. 33. 1839. 
Mammillaria humboldtii Ehrenberg, Linnaea 14: 378. 1840. 
Mammillaria sphaerotricha rosea Salm-Dyck, Cact. Hort. Dyck. 1849. 85. 1850. 
Cactus humboldtti Kuntze, Rev. Gen. Pl. 1: 260. 1891. Not Humboldt, Bompland, and Kunth, 1823. 
Cactus sphaerotrichus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Mammillaria candida rosea Salm-Dyck in Schumann, Gesamtb. Kakteen 525. 18098. 
Cespitose; individual plant globose, 5 to 7 cm. in diameter, almost hidden by the white spines; 
tadial spines numerous, radiating; central spines 8 to 12, porrect, often brownish at tip, a little 
stouter than the radials; axils setose; flowers 2 cm. long, rose-colored; perianth-segments serrulate 
twards the apex; fruit red; seeds black. 
Fics. 141 and 142.—Neomammnillaria candida. 
Type locality: Near San Luis Potosf. 
Distribution: Central Mexico. 
Illustrations: Monatsschr. Kakteenk. 29: 141, as Mammnillaria candida rosea; Hort. 
Belge 5: pl. 117; MOllers Deutsche Girt. Zeit. 25: 475. f. 8, No. 27; Blithende Kakteen 3: 
pl. 169, as Mammillaria candida. 
Figure 141 is from a photograph of a plant obtained by Dr. Palmer near San Luis 
Potosi in 1905; figure 142 is from a photograph of a plant collected by C. A. Purpus from 
near the same locality in r9ro. 
>91. Neomammillaria vetula (Martius). 
> Mammillaria vetula Martius, Nov Act. Nat. Cur. 16: 338 
J I s, . . . . 16: . 1832. 
Cactus vetulus Kuntze, Rev. Gen. Pl. 1: 261. 1891. %8 ws? 
_ Plant somewhat club-shaped, small, 4 to 5 cm. high: tubercles i somewhat 
shining; axils of tubercles naked or sometimes with a all tuft of wool, raat spines about 25, 
Spreading, white, bristle-like; central spines 1 to 6, stouter than the radials, brownish; flowers 12 to 
15 mm. long, borne at upper part of plant; outer perianth-segments red with yellowish margins; 
inner perianth-segments cream-colored; filaments greenish; style green; stigma-lobes 5, white. 
