STUDIES OF MEXICAN AND CENTRAL AMERICAN 



PLANTS \n, .V 



By .!. N. Rose 



INTRODUCTORY NOTES. 



The following studies consist Largely of description- of new species 

 from the rich gleanings of Dr. C. (t. Pringle and Dr. E. Palmer, and 

 of various Government collectors. Of the latter, Messrs. K. W. Nelson 

 and E. A. Goldman continue year after year to send in large accessions. 

 Very large amounts of material have also been obtained by myself and 

 assistants, aggregating now more than lo,00o numbers. 



On May 15, L905, I was authorized by the Assistanl Secretary of 

 the Smithsonian Institution to proceed to Mexico for the purpose of 

 making botanical exploration-, this being my fifth commission of the 

 kind. Mr. Jos. II. Painter, also of the National Museum, was for 

 the second time sent with me, and his previous experience, together 

 with his enthusiasm for botanical exploration, added greatly to the 

 success of the expedition. My son. Joseph S. Rose, accompanied us 

 as a private assistant. The City of Mexico was made our principal 

 base, and thither we returned repeatedly during the season. We 

 made short trips thence to Tlalpam. San Angel, Santa Fe, Guadalupe, 

 Tlalnepantla. and the Hacienda de la Kncarnacion. ail in the Valley 

 of Mexico; also longer trips to Cuernavaca and Yautepec in Morelos, 

 to Tula, Pachuca, Somoriel, and Tulancingo in Hidalgo, and to [guala 

 in Guerrero. With [xmiquilpan, Hidalgo, as a base, work was done on 

 the neighboring mountains and plains, and a side t rip was taken to the 

 Sierra de la Mesa, some 20 miles to the east. With San Juan del Rio 

 as a base, a trip was made through the cactus deserts of Quere*taro. 

 With Tehuacan. Puebla, as a base, a considerable amount of work was 

 done on the plains and mountains about that town, whence, also, side 

 trips were made to Tomellin and San Sebastian. 



o Continued from Vol. VIII, p. 339, of the Contributions. 



