( 4060 ) 



MAMMILLARIA TETRACANTHA^ FoiJR-SPINED 



Mammillaria. 



Class and Order. 



ICOSANDRIA 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 subrotundi aut cylindracei, lactescentes aut succo lim- 

 pido repleti, aphylli, tuberculis subconicis mammaformibus 

 spiraliter dispositis, apice spimdas radiantes et tomentum 

 demum deciduum gerentibus obtecti. Flores inter basin 

 mammillarum sessiles, scepius in zonam transversam dispo- 

 siti. Bacca obovata, edulis, calyce marcescente, demum 

 deciduo, coronata. Pfeiff. 



Specific Character and Synonyms. 



Mammillaria tetracantha: subglobosa simplex, axillis la- 

 natis, mammillis confertissimis gracilibus anguloso- 

 pyramidatis, aculeis ex areola fere nuda regulariter 4 

 brevibus rigidis, infimo caeteris paulo longiore, juniori- 

 bus rubellis apice nigricantibus tandem albidis. Pfeiff. 



Mammillaria tetracantha. " Salm." Pfeiff. Enum. Cact. 

 p. 18. 



The plant here figured has long been cultivated in the 

 Cactus-house of the Royal Botanic Gardens, Kew, under 

 the above appellation: and it appears sufficiently to accord 

 with that of the same name published by Pfeiffer, the only 



author, 



VOL. XVII. 



