204 UNITED STATP:S and MEXICAN BOUNDARY. 



a tree 40 feet in height, with a trunk 8 inches in diameter. We have sj)ecimens of another 

 Alnusj collected in California by Rev. A. Fitch^ which seems to he A. rhombifolia, Nutt. It 

 differs from A. serrulata in the coarse teeth of the leaves, and from all other North American 

 species in the long acute base of the leaves, 



Alnus oblongifolius (n. sp.) : ramis glabris nitidis ; foliis oblongo-lanceolatis utrinque 

 acutis subduplicato-serratis supra glaberrimis subtus minutissime pubescentibus utrinque viridi- 

 bus ; nuculis apteris. Banks of the Mimbres and near Santa Barbara^ New Mexico. (No. 1864j 

 Wright.) A tree 30 feet high. Leaves 2|-3| inches long and 1-1^ inch wide ; unequally ser- 

 rate, serratures glandular at the tip ; petiole about one-third as long as the lamina. Catkins 

 somewhat paniculate, ovate. Nutlets orbicular-obovate, without any trace of a wing. 



SALICACE^. 



MuM 



4, S. lasiandra, BentJi. PI, Eartw. p. 335 ; Torr. Bot. Whipple Bep. p. 138. Mountains of 



California, (the precise station not recorded ;) Parry. '^ A straggling shrub/' 



Salix Wrightii, Aiiders. I. c. Borders of the Upper Eio Grande, in western Texas and Chi- 

 huahua ; also near Lake Santa Maria. (No. 18T7, Wright.) A tree 15 to 25 feet high. 



Salix longifolia, Muhl.; Anders. I. c. Between the Pecos and the Kio Grande, and westward 

 to the lower Rio Gila. 



I have not ventured to name five or six other willows of the Mexican Boundary collections. 

 Mr. Anderson is preparing a more complete account of this exceedingly difficult genus. He has 

 shown that many of our Salices, until recently supposed to be different from any in the Old 

 World, are identical with European species^ or only varieties of them. He desires contributions 

 of specimens from our botanists, that he maybe able to perfect his contemplated work. . 



PopuLUS TRicHOCABPA, Torr. in Hook. Ic. 9, t. 878, Borders of Santa Clara river, near Buena- 

 ventura ; Parry. A tree 30 feet high, with smooth bark. This species is easily distinguished 

 by the hairy fruit. 



PopuLus MONILIFERA, Alt. ; Miclix. f. Sylv. 1, p. 116, t. 96, /. 2. Borders of streams from 

 western Texas and New Mexico to California. This is the ordinary cotton-wood of the West. 



PopuLUS TREMULoiDES, Miclix. FL 2, p. 143 ; Michx.f. Sylv. \^p. 125, t. 99, /. c. Hills near 



the Copper Mines, in fruit, June; Bigeloiv. (No. 1870, Wright.) 



PopuLUS BALSAMiFERA, L. ; Michx. f. Sylv. 2, p. 121, t. 98, /. 1. Bants of the Mimbres; 



Bigeloiv. 



N. YorJc, 2, p. 249 ; Nutt. Syl 



Mines of New Mex 



This is the 



Narrow-leaved Poplar of Lewis and Clark's Travels. It is No. 817 of Fendler^s N. Mexican 



Collection. 



PLATANACE^. 



Platanus racemosa, Nutt. in Audubon's Birds^ 1, t. 362, dt Sylv. 1, p. 47, t. 15 ; Newberry 

 Bot. Williamson d Abbott's Rep. p. 33, /. 10. P. Mexicana, Moric. V. Californica, Benth. 

 Borders of streams near San Diego^ etc., California; Parry. Guadalupe Canon, Sonora ; 

 Thurber. A large tree, sometimes 50-60 feet high, Hartweg states that in California he has 

 seen it 80 feet high and 12 feet in circumference. 



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