REVISION OF THE GENUS CEREUS MILL. 



71 



In drying, the flowers of Piptanthocereus invariably turn 

 black, whilst others, for instance Eucereus, Aporocactus, 



etc., keep their 

 herbarium. . 



beautiful colors for a long time in the 



The following species belong here : 



Cerens (Piptanthocereus) azureus Parm. 1. c. 118. 



C. (Piptanthocereus) Cavendishii Monv. 1. c. Nachtr. 40. 



Southern Brazil. 



South 



America. 



Argentina. 

 Argentina. 



C. (Piptanthocereus) chalybaeus Otto. 1. c. 120. 



G\ (Piptanthocereus) coerulescens Salm. 1. c. 121. 



C. (Piptanthocereus) Forbesii Otto. 1. c. 111. 



G. (Piptanthocereus) euchlorus Web. 1. c. 84. 



Cm (Piptanthocereus) Hankeanus Web. 1. c. 81 



On (Piptanthocereus} Hildmannianus K. Sch. 1. c. 110. — Brazil. 



C. (Piptanthocereus) Jamacaru DC. 1. c. 112. 



Argentina. 



Brazil. 



Argentina. 



Brazil. 



C. (Piptanthocereus) lamprospermus K. Sch. 1. c. Nachtr. 33. — Para- 

 guay. 



C. (Piptanthocereus) lepidotus Salm. L c. 109. — Cuba. 



C. (Piptanthocereus) pachyrhizus K. Sch. 1. c. Nachtr. 33. —Paraguay. 



C. (Piptanthocereus) paraguayensis K. Sch. 1. c. Nachtr. 34. — Para- 

 guay. 

 C. (Piptanthocereus) Paxtonianus Monv. 1. c. 134, Nachtr. 40. — South 



America. 

 C '. (Piptanthocereus) peruvianus Mill. 1. c. 113. — Brazil, W.Indies, 



Mexico. 



C. (Piptanthocereus) phatnospermus K. Sch. 1. c. Nachtr. 43. — Para- 

 guay. 



C. (Piptanthocereus) Pitahaya DC. 1. c. 116. — Brazil, Uruguay. 



C. (Piptanthocereus) Spegazzinii Web. 1. c. Nachtr. 42. —Paraguay. 



C. (Piptanthocereus) stenogonus K. Sch, 1. c. Nachtr. 31. —Paraguay. 



C. (Piptanthocereus) tetragonus Haw. 1. c. 86. — Brazil. 



C. (Piptanthocereus) xanthocarpus K. Sch. 1. c. Nachtr. 32.— Paraguay. 



i 



The flower and large fruit of plate 6 are from the tall 



_ v k-v a tm 



Get 



plate 5. This 



plant is one of the most remarkable specimens of this family 

 on the Riviera. It stands in the garden of the Casino at 



Monte Carlo. Flowers and fruits were sent to me by the 



The same 



Van 



plant has been figured in the Monatsschrift fur Kakteen- 

 kunde, 1900, p. 7, under the name of Cereus peruvianus. 

 At Monte Carlo it is named Cereus validus Haw. 



i 



