62 



THE CACTACEAE. 



We have followed most recent writers in combining Cereus dautwitzii with Cereus 

 lanatus, although we have not seen the type of either. We know, however, that Cereus 

 dautwitzii came from Huancabamba, Peru, while Cactus lanatus, upon which Cereus lana- 

 tus was based, came from Guancabamba, Ecuador ; the names, varying only in the initial 

 letter, are different spellings for the same place. The northern boundary-line of Peru has 

 pushed north since Humboldt visited this region; his station of Guancabamba is now in 

 Peru instead of Ecuador. 



The sweet, edible fruit is called soroco in southern Ecuador; it is also called piscol 

 Colorado, according to Humboldt. 



Fig. 91. — Espostoa lanata. 



The typical form was collected by J. N. Rose, A. Pachano, and George Rose in the 

 Catamayo Valley, southern Ecuador, October 3, 1918 (No. 23326) and the other form was 

 collected by Dr. and Mrs. Rose near Matucana, central Peru, altitude about 7,000 feet, 

 July 9, 1914 (No. 18649). Dr. Rose also collected a living plant above Chosica (No. 18537) 

 and herbarium specimens between Matucana and San Bartelome (No. 18748). Dr. W. H. 

 Osgood has sent us photographs of a cactus which we would refer here. One was taken 

 near Chilete, Peru, altitude 1,000 feet, and the other between Menocucho and Otuzco, 

 Peru, altitude 3,000 feet. 



Pilocereus haageanus (Monatsschr. Kakteenk. 6: 96. 1896) is sometimes referred to 

 but was never published. 



