I30 



THE CACTACEAE. 



Type locality: Near Viesca, in Coahuila, Mexico. 

 Distribution: Coahuila, Mexico. 



Illustration: Monatsschr. Kakteenk. i6: 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 (Schei dweller). 



Mammillaria Candida Scheidweiler, Bull. Acad. Sci. Brux. 5: 496. 1838. 



Mammillaria sphaerotricha Lemaire, Cact. Gen. Nov. Sp. 32,. 1839. 



Mammillaria humboldtii Ehrenberg, Linnaea 14: 378. 1840. 



Mammillaria sphaerotricha rosea Salm-Dyck, Cact. Hort. Dyck. 1849. 85. 1850. 



Cactus humboldtii JLuntze, Rev. Gen. PI. i: 260. 1891. Not Humboldt, Bompland, and Kunth, 1823. 



Cactus sphaerotrichus Kuntze, Rev. Gen. PI. i: 261. 1891. 



Mammillaria Candida rosea Salm-Dyck in Schumann, Gesamtb. Kakteen 525. 1898. 



Cespitose ; individual plant globose, 5 to 7 cm. in diameter, almost hidden by the wliite spines ; 

 radial 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. 



Figs. 141 and 142. — Neomammillaria Candida. 



Type locality: Near San Luis Potosi. 



Distribution: Central Mexico. 



Illustrations: Monatsschr. Kakteenk. 29: 141, as Mammillaria Candida rosea; Hort. 

 Beige 5: pi. 117; MoUers Deutsche Gart. Zeit. 25: 475. f. 8, No. 27; Bliihende Kakteen 3: 

 pi. 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 19 10. 



91. Neomammillaria vetula (Martius) . 



Mammillaria vetula Martius, Nov. Act. Nat. Cur. 16: 338. 1832. 

 Cactus vetulus Kuntze, Rev. Gen. PI. i: 261. 1891. 



Plant somewhat club-shaped, small, 4 to 5 cm. high; tubercles terete, light green, somewhat 

 shining; axils of tubercles naked or sometimes with a small tuft of wool; radial spines about 25, 

 spreading, white, bristle-like; central spines i 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. 



