78 



MISSOURI BOTANICAL GARDEN. 



plants further differ greatly from fully grown specimens 

 Cereus Dussii K. Schumann I.e. 89 is the same plant. 



Subsection V. Heliocereus A. Bersr. 



Stems more or less upright, 3-4-angled. Flowers red or white, 



diurnal. 





Cereus (Heliocereus) amecaensis Heese. 1. c. 154. — Mexico. 

 C. (Heliocereus) coccineus Salm. 1. c. Nachtr. 53. — Mexico. 

 C. (Heliocereus) Schrankii Zucc. 1. c. Nachtr. 52. —Mexico. 

 C. (Heliocereus) speciosus K. Sch. 1. c. 153. — Mexico. 



These few species are very closely related. 

 The Heliocerei are much grown for the sake of their 

 most brilliant flowers, especially C. speciosus. 



latter 



This 

 species has given origin to many of the much 



admired hybrids with Phyllocactus. 



Subsection VI. Phyllocereus A. Berg. 



Epiphytic, climbing, stems flat resembling those of Phyllocatus. 

 Flowers large with hairs and bristles similar to those of Subsection 

 II. Selenicereus. 



Cereus (Phyllocereus) Wittii K. Sch. 1. c. Nachtr. 50. — Brazil. 



g Cereus. The numerous and 



densely set areoles along the borders are armed with small 

 bristles. It forms a beautiful connecting link with Phyl- 

 locactus, though it doubtless belongs to Cereus. 

 If anyone wishes to reunite 



Ph 



Cereus, 



it ought to be placed here as a subgenus next to 



Eucereus-Ph 

 Weber ha 



Phyllocactus 



Costa Rica, which has the ovary and the fruit densely 

 covered with scales. This would be a transition from 

 Phyllocactus to Phyllocereus. 



