250 THE CACTACEAE. 



collected many cacti, especially species of Neomammillaria, duplicating many of the 

 important discoveries made b}- Dr. Rose on the same islands in 191 1. He has also sent us 

 cacti from Colorado. 



Professor Fortunate L. Herrera has sent some ver\' interesting plants from eastern 

 Peru, especially from about his home at Cuzco. 



Mr. Robert Runyon has collected extensively in southern Texas and northern Mexico 

 and has supplemented his specimens with some verj^ beautiful photographs. 



Dr. L. H. Bailey and his daughter, ]Miss Ethel Zoe Bailey, obtained valuable cacti 

 from Venezuela, especially from the region about Ciudad Bolivar, on the Orinoco, in 1921. 



jSIr. W. B. Alexander was sent to Argentina by the Australian Government in 1920 

 and 1 92 1 in search of enemies of the weed prickly pears and there made many important 

 obser\-ations, especially on the genus Opuntia. He sent us two undescribed species. 



Dr. B. P. Reko, a very diligent collector, has sent many cacti from Mexico, especially 

 from Oaxaca, including several new to science. 



Sefior Octavio SoHs, in charge of the cactus garden belonging to the Mexican Govern- 

 ment in the City of ]Mexico, has sent many living plants from his country, especially of the 

 g^-mi?, Xeomammillaria. To him we have dedicated the genus Solisia. 



Senor J. G. Ortega has collected extensively on the west coast of Mexico, especially 

 in the state of Sinaloa, and for him we have named XeomammiUaria ortegae. 



IMr. J. Francis ]Macbride and Mr. William Featherstone, who were in charge of the 

 botanical expedition of the Field ISIuseum to Peru in 1922 and 1923, made large and valuable 

 collections of cacti in central and eastern Peru. 



!Mr. E. C. Rost has collected and photographed many interesting cacti for us in 

 southern California and Lower California. 



Dr. W. S. W. Kew explored extensively in Tower California in 1921 and sent not only 

 many specimens but numerous habit photographs. 



Mr. James H. Ferriss, while making various excursions through the western United 

 States, has sent in many specimens. Among his interesting discoveries was the finding 

 of Neomammillaria pottsU in southern Texas. 



Mrs. S. L. Pattison, an enthusiastic collector in western Texas, has sent many valuable 

 specimens, including new species collected by herself or for her by local collectors. 



]SIrs. Ruth C. Ross spent considerable time in eastern Arizona in 192 1 and collected 

 cacti along the route traversed by Emory in 1847, re-collecting certain species which he 

 had discovered at that time. 



]Mr. Harr}" Johnson was located for about a year in Guatemala, during which time he 

 sent a number of ver}- interesting cacti, especially species of Epiphyllum. Some of these 

 were accompanied by full notes and drawings. 



Senor P. Campos-Porto has sent a number of interesting specimens from Brazil belong- 

 ing to the genus Rliipsalis. 



The following persons have contributed valuable specimens, usually from about their 

 homes or while engaged in other work: G. W. Goldsmith, Colorado; B. C. Tharp, Texas; 

 Charles 0. Chambers, Oklahoma; James S. Holmes, Washington, D. C. ; Joseph A. Holmes, 

 Wyoming; William Hertrich, California; William Tell, Texas; Albert Ruth, Texas; D. C. 

 Parman, Texas; Karl Reiche, Mexico; Gerold Stahel, Surinam; Rev. Louis Mille, Ecuador; 

 H. M. Pilkington, Haiti; Percy L. Ports, Washington, D. C; W. E. Broadway, Trinidad; 

 A. F. ]Moeller, ^Mexico; W. E. Meyer, Bolivia; Stephen E. Aguirre, INIexico; i\Irs. Elsie 

 McElroy Slater, Texas; Paul C. Standley, Central America; R. D. Camp, Brownsville, 

 Texas; George L. Fisher, Texas; A. V. Erie, Mexico; and Dana Lee, Wyoming. 



As treated in this monograph the Cactus family is composed of 3 tribes. The first 

 and second tribes are taken as units, but the third is composed of 8 subtribes. The number 

 of genera recognized is 124 and the number of species is 1,235. 



