106 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 
crimson. 
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 Schumann 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 obscura 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. Belge 4: pl. 6; Rother, Praktischer Leitfaden Kakteen 37, as 
Mammillaria galeottii; Forster, Handb. Cact. ed. 2. 323. f. 32; Dict. Gard. Nicholson 2: 
321. f. 508, as Mammillaria dolichocentra. 
Fic. 106.—Neomammiillaria kewensis. Fic 
- 107.—Neomammillaria subpolyedra. 
~ 59. Neomammillaria tetracantha (Salm-Dyck). 
Mammillaria tetracantha Salm-Dyck in Pfeiffer, Enum. Cact. 18. 1837 
» Mammillaria obconella Scheidweiler, Hort. Belge 4:93. 1837. 7 
Mammillaria dolichocentra Lemaire, Cact. Aliq. Nov. 3. 1838. 
Mammillaria dolichocentra staminea Labouret, Monogr. Cact. 50. 1853 
Cactus obconella Kuntze, Rev. Gen. Pl. 1: 259. 1891. ; 
Cactus dolichocentrus Kuntze, Rev. Gen. Pl. 1: 260. 1891. 
Cactus tetracanthus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
4 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 10 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 incurved, longer, 2 5 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. 
