414 PROCEEDINGS OP THE AMERICAN ACADEMY 



XXIV. 



CONTRIBUTIONS TO AMERICAN BOTANY. 

 By Sereno Watson. 



Communicated April 14, 1886. 



1. List of Plants collected by Dr. Edivard Palmer in Southwestern 

 Ghihuahua, Mexico, in 1885. 



The very interesting collection of plants of which a list is here given 

 was made in the Sierra Madre, in the southwestern jjortion of the 

 provinca of Chihuahua, and chiefly in the neighborhood of the mining 

 town of Batopilas. The particular localities given by Dr. Palmer are 

 Hacienda San Miguel, one mile from Batopilas, at an altitude of 2,400 

 feet above the sea, and Hacienda San Jose, about twenty-five miles 

 distant southward and at a considerably lower elevation, both these 

 places being upon the Batopilas River, which flows through a very con- 

 tracted valley, the steep rocky mountain slopes and spurs coming down 

 so close to the stream that even a mule track is barely possible along 

 its course ; Cumbre, on the summit of the mountains above Batopilas, 

 at an elevation of 8,850 feet ; Frayles, intermediate between Cumbre 

 and Batojjilas, alt. 7,000 feet ; Yerba Buena, a similar locality at the 

 same altitude ; and Norogachi, an Indian village about 150 miles north 

 of Batopilas, at about 8,500 feet altitude. These latter places are in 

 a rough broken region, intersected by numerous ridges and ravines and 

 surrounded at no great distance by high mountain peaks, more or less 

 covered by pines and oaks, with occasional grassy openings. A con- 

 siderable amount of snow falls here in winter, and a comparatively low 

 temperature is reached. The collections at the haciendas were made 

 mostly in August and September, at Cumbre and Frayles in October, 

 at Yerba Buena and Norogachi, in November. The determinations of 

 the gamopetalous species were made by Dr. Gray, of the Cyperacece by 

 Dr. N. L, Britton, of the Gramineoe by Dr. George Vasey, and of 

 the cryptogams by Prof. D. C. Eaton. The numbers and letters in 

 parentheses are those under which the collection has been distributed. 



