io6 



THE CACTACEAE. 



Solitary or cespitose, globose; tubercles pointed; spines 4, elongated, the upper ones erect and 

 connivent over apex of plant, on older tubercles weak and spreading, 2.5 cm. long, pale rose to 



Type locality: Mexico. 



Distribution: Mexico. 



We have not seen this plant, but we have examined the illustration which accom- 

 panies the original description. L. Quehl has had it in cultivation, and sent us a photograph. 



This must be a very distinct species and not at all closely related to Mammillaria 

 dolichocentra, to which Schumaim referred it as a variety, crediting himself as the authority; 

 the name, however, had been used by Forster in 1846. The illustrations in Forster's Hand- 

 buch der Cacteenkunde and in Nicholson's Dictionary cited below probably are not to be 

 referred here and they certainly should not be referred to Mammillaria dolichocentra. 



Mammillaria ohscura galeottii Salm-Dyck (Forster, Handb. Cact. 213. 1846) is men- 

 tioned as a synonym of this species, but so far as we can learn it was never described. 



Illustrations: Hort. Beige 4: pi. 6; Rother, Praktischer Leitfaden Kakteen 37, as 

 Mammillaria galeottii; Forster, Handb. Cact. ed. 2. 323. f. 32; Diet. Gard. Nicholson 2: 

 321. f. 508, as Mammillaria dolichocentra. 



Fig. 106. — NeomammiUaria kewensis. 



Fig. 107. — NeomammiUaria subpolyedra. 



59. NeomammiUaria tetracantha (Salm-Dyck). 



Mammillaria tetracantha Salm-Dyck in Pfeiffer, Enum. Cact. 18. 1837. 



Mammillaria ohconella Scheidweiler, Hort. Beige 4: 93. 1837. 



Mammillaria dolichocentra Lemaire, Cact. Aliq. Nov. 3. 1838. 



Mammillaria dolichocentra staminea Labouret, Monogr. Cact. 50. 1853. 



Cactus obconella Kuntze, Rev. Gen. PI. i: 259. 1891. 



Cactus dolichocentrus Kuntze, Rev. Gen. PI. i: 260. 1891. 



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



Mammillaria rigidispina Hildmann, Monatsschr. Kakteenk. 3: 112. 1893. 



Mammillaria dolichocentra brevispina Riinge, Monatsschr. Kakteenk. 3: 112. 1893. 



Nearly globular, 6 to 8 cm. in diameter; axils of tubercles with scanty persistent wool ; tubercles 

 8 to ID mm. long, obscurely 4-angled; areoles small, at first lanate, somewhat 4- angled; spines 4, all 

 radial, slender, the 3 lower equal, the upper one incm-ved, longer, 25 mm. long, when young all 

 yellowish white, in age grayish yellow or brown ; flowers numerous from towards top of plant, small, 

 pinkish to rose-colored; inner perianth-segments narrowly lanceolate, acuminate. 



Type locality: Mexico, but no definite locality cited. 

 Distribution: Mexico, but range unknown. 



