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MAM MILLAR I A PYCNACANTHA. DENSELY- 

 SPINED MAMMILLARIA. 



********************* 

 Class and Order. 



POLYANDRIA MoNOGYNIA. 



( Nat. Ord. — CactejE. ) 



Generic Character. 



Calycis tubus ovario adhaerens ; lobi 5 — 6 colorati fruc- 

 tum juniorem coronantes. Petala 5 — 25 a calyce vix dis- 

 tincta, eo longiora et cum sepalis in tubum concreta. 

 Stamina filiformia pluriserialia. Stylus filiformis. Stigma 

 3 — 7-fidum radiatum. Bacca laevis oblonga. Semina nidu- 

 lantia. Cotyledones minutae, acuminata?. — Suffrutices car- 

 nosi t subrotundi aut cylindracei, lactescentes aut succo lim- 

 pido repleti, aphylli, tuberculis subconicis mammceformibus 

 spiraliter dispositis, apice spinulas radiantes et tomentum 

 demum deciduum gerentibus. F lores inter basin mammil- 

 larum sessiles, sapius in zonam transversam dispositi. Bac- 

 ca obovata, edulis, calyce rnarcescente, demum deciduo, coro- 

 nata. Pfeiff. 



Specific Character and Synonyms. 



Mammillaria pycnacantha ; subrotundo-cylindracea, mam- 

 millis latiusculis superne obscure bilobis, aculeis 

 12 — 16 pallidis patenti-recurvatis demum fuscatis seriei 

 interioris robustioribus, lana floccosa in axillis areolis- 

 que superioribus et circa flores. 



Mammillaria pycnacantha. Mart. — Lehm. in Act. Nov. 

 Cur. v. 16. p. 325. t. 17. Pfeiff. Enum. Cact. p. 16. 



From the collection in the Royal Gardens of Kew : a 

 native, it is said, of the neighbourhood of Oaxaca, Mexico. 

 The plant, figured by Lehmann, in the work above quoted, 

 represents a young plant, more elongated than usual. In 



other 



