NEOMAMMII^LARIA. 1 65 



rows ; spine-areole circular, small ; radial spines 10 to 1 2, spreading, acicular, white, 4 mm. long or less ; 

 central spines 2, stouter, but not much longer than the radials, somewhat brownish, more or less erect ; 

 flowers from the top of the plant but in the axils of old tubercles, the tube not exserted and the limb 

 appressed against the adjacent tubercles; perianth rotate, 16 mm. broad, its segments, stamens, and 

 style pale lemon -yellow ; outer perianth-segments oblong, obtuse with ciliate margins, the inner 

 a little longer than the outer, usually entire, oblong, usually retuse at apex, sometimes apiculate. 



Sent by B. P. Reko (No. 4401) but collected by A. Groeschner from the vicinity of 

 Monte Mercado, Durango, Mexico, in 1922 and flowered in Washington in May 1923. 

 Figure 184 is from a ptiotograph of the type specimen. 



LITTLE-KNOWN SPECIES PROBABLY OF THIS GENUS. 



MammiIvLARIA alpina Martins in Salm-Dyck, Cact. Hort. Dyck. 1849. 79. 1850. 

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



This plant has not been identified. Its large flowers, 2.5 cm. broad, suggest a species 

 of Coryphantha. It was collected by Karwinsky in the state of Oaxaca. 



Mammillaria bellatula Forster, Allg. Gartenz. 15: 51. 1847. 

 Cactus bellalulus Kuntze, Rev. Gen. PL i: 259. 1891. 



Spherical, somewhat compressed, bright green ; tubercles broadly cone-shaped, 4 mm. long, their 

 axils naked; spine-areoles white-woolly when young; radial spines 12 to 16, whitish, bristle-like, 

 spreading, 6 to 8 mm. long; central spines 2, straight, one pointing downward, the other upward, 12 

 to 16 mm. long, at first almost black, grayish brown in age; flowers and fruit unknown. 



This species is said to have been grown from Brazilian seed ; if this were true it would 

 exclude it from this genus and for this reason Schumann questioned whether it might not 

 be an Echinocactus . Judging from the description we believe that it is closely related to 

 N eomammillaria elegans and is probably of Mexican origin. 



Mammillaria bergii Miquel, Comment. Phytogr. 104. 1840. 



Simple, subglobose, glaucous green ; tubercles somewhat 4-angled at base, nearly terete above, 

 woolly in the axils; spine-areoles woolly when young, becoming naked; spines 4, spreading, the 

 uppermost one largest. 



This plant is from Mexico. 



Mammillaria caBSPititia De Candolle, Mdm. Mus. Hist. Nat. Paris 17: 112. 1828. 



Mammillaria nitida Scheidweiler, Allg. Gartenz. 9: 42. 1841. 

 Cactus caespititius Kuntze, Rev. Gen. PL i: 260. 1891. 



Densely cespitose, the clump 10 cm. in diameter; joints globose, 2.5 cm. in diameter; tubercles 

 small, ovate; spines straight, rigid, when young whitish yellow, in age gray; radial spines 9 or 10; 

 central spines i or 2, longer than the radials, erect; flowers and fruit unknown. 



Both Pfeiffer and Schumann overlooked this species and it is doubtful if it can ever 

 be identified. The plant was collected by Thomas Coulter in Mexico. 



Mammillaria conica Haworth, Suppl. PI. Succ. 71. 18 19. 



Tubercles large, conic; spines less than 10, all radial, red but paler at base; flowers and fruit 

 unknown. 



Neither Pfeiffer nor Schumann knew this species or its origin. The Index Kewensis 

 refers it to South America. If from that region it must be a species of Discocactus, near 

 D. placentiformis . 



