6 



THK CACTACEAE. 



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The 



In the West Indies we have explored all of the Greater Antilles, the Bahamas 

 the Virgin Islands, St. Christopher, Antigua, Barbados, and Curasao. 



In South America our field study included the most important deserts of Peru 

 Bolivia, and Chile, and parts of Brazil, Venezuela, Ecuador, and Argentina, 

 cactus deserts of South America are so extensive and so remote from one another 

 that it was possible to visit only a part of them in the four seasons allowed for 

 their exploration. 



Among many enthusiastic volunteers whose contributions of specimens and 

 data have greatly supplemented our own collections and field studies, the following 

 deserve especial mention: 



Mr. Henry Pittier has made valuable sendings from Colombia, Venezuela, 

 Panama, Costa Rica, and Mexico; Mr. O. F. Cook, from Guatemala and Peru; 

 Mr. G. N. Collins, the late Federico Eichlam, Mr. R. H. Peters, Mr. C. C. Deam, 

 Mrs. T. D. A. Cockerell, Baron H. von Tiirckheim, and the late Professor W. A. 

 Kellerman have sent important collections from Guatemala; Mr. A. Tonduz, 

 Mr. Ot6n Jimenez, Dr. A. Alfaro, Mr. C. Werckle, and Mr. Alfred Brade, local 

 collectors and naturalists in Costa Rica, have sent much good material from their 

 country; Mr. William R. Maxon has sent new and rare material from Costa Rica, 

 Guatemala, and Cuba; Professor C. Conzatti and his son. Professor Hugo Conzatti, 



^^; ^; ^: ^"?l^^'i^^: ^A^^^^^ Chaffey, Mrs. Irene Vera, M. Albert de Lautreppe, 



many interesting specimens from 



and the late Mr. E. A. H. Tays have 



Mexico ; Mr. W. E. Safford made a valuable collection in Mexico in Tqc; -E.W. Nelson 

 and E. A. Goldman, who have collected so extensively in Mexico and the Southwest 

 have obtamed many herbarium and living specimens for our use; Mrs. Gaillard! 

 who lived at Panama several years while the late Colonel D. D. Gaillard was a 

 member of the Isthmian Canal Commission, collected interesting cacti, including 

 hptphyllum gaillardae; the late Dr. H. E 



Hasse 



specimens from southe 



aided 



Cahforma and Arizona; C. R. Orcutt, the well-known cactus fancier, has 



us m many ways besides sending us specimens from his collections; Dr. R. E. Kunze 

 has frequently sent specimens, especially from Arizona; General Timothy E. Wilcox, 



for whom Wilcoxia was named . has 



his son, Dr. G 



Wilcox, contributed 



specimens from the Southwest, while 



ndings from the west coast of 



!!!!'?. 'l^r "='!'"'"• ^f-.°- T- MacDougal has sent many specimens from 



over the Southwest 



pecially from Mexico, Arizona, and 



II' !!i?e Ti\''"'''^T^r'?^^ ^"'^^ ^^^-t^ d^^-^ts, which have yielded 



California 



and has contributed many excellent photographs, quite a number of 



(T 



produced in this report 



). Professor F. E. Lloyd, while located 



and traliTmr TT' ^^^'^°- ^^ ^^^^' ^^.Z^^ 

 ^J°I^^^ "S''""!?'' "ften accompanied by valuable field notes, sketches 



photograph 



Dr. Forrest Shreve has 



and 

 specimens, especially from northern 



Mr. W. T. 



Arizonn anH A/T,- Air tt t r -i^^v^mx^ii^, cbpiiciauy rroi 



sZkr have^urnTshed T^ '^ '"^" ^'="'=°' ^^- ^^ ^- ''^"'^ -'J ^r. W. 1 



fom a '"pect . p "^^^^^^^^ fP-'"'^- -^ -luable notes on southern Cali- 



and niri:„ /!.?"! J- J-7^'' ""L^-- ^^' "^'i*^ valuable contributions of material 



and notes from Arizona: Mr 



M. E. J 



Mr. I. Tidestrom, Mr. Thomas H 



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