seen it 80 feet 25 and 12 feet in circumference. 
204 UNITED STATES AND MEXICAN BOUNDARY, 
а tree 40 feet in height, with a trunk 8 inches in diameter. We have specimens of another 
Alnus, collected in California by Rev. А. Fitch, which seems to be 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. 1864; 
Wright.) A tree 30 feet high. Leaves 21-33 inches long and 1-1] inch wide; unequally ser- 
rate, serratures glandular at the tip; petiole about one-third as long as the нв, Catkins 
somewhat paniculate, ovate. Nutlets orbicular-obovate, without any trace of a wing. 
SALICACEJE. 
SALIX LUCIDA, Muhl. Var. ANGUSTIFOLIA, Anders. Salices Bor.- Amer. in Proceed. Amer. Acad. 
4. 8. lasiandra, Benth. Pl. Hartw. p. 835; Torr. Bot. Whippl. Rep. р. 188. Mountains of 
California, (the precise station not recorded ;) Parry. ‘‘ A straggling shrub.” 
SALIX WRIGETI, Anders. l.c. Borders of the Upper Rio Grande, in western Texas and Chi- 
huahua ; also near Lake Santa Maria. (Хо. 1877, Wright.) А tree 15 to 25 feet high. 
ÑALIX LONGIFOLIA, Muhl.; Anders. 1. c. вера the Pecos and the Rio 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 may be able to perfect his contemplated work. 
POPULUS rRICHOCARPA, 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, Ait. ; Micha. f. Sylv. 1, p. 116, Е 96, f. 2. Borders of streams from 
western Texas and New Waki to California. This i is the ordinary cotton-wood of the West. 
POPULUS TREMULOIDES, Michz. Fl. 2, p. 143; Micha. f. Sylv. 1, р. 125, t. 99, f. c. Hills near 
the Copper Mines, in fruit, June; Bigelow. (No. 1870, Wright.) : 
POPULUS BALSAMIFERA, L.; Micha. f. Sylv. 2, p. 121, t. 98, f. 1. Banks of the Mimbres; 
Bigelow. 
POPULUS ANGUSTIFOLIA, James; Torr. Ann. Lyc. N. York, 2, p. 249; Nutt. Sylv. 1, p. 52, t. 16. 
Near the Copper Mines of New Mexico and on the banks of the Mimbres ; Bigelow. This is the 
Narrow-leaved Poplar of Lewis and Clark’s Travels. It is No. 817 of Fendler’s N. Mexican 
Collection. 
Р,АТАХАСЕЖ, 
PLATANUS RACEMOSA, Nutt. in Audubon’s Birds, 1, t. 362, & Sylv. 1, p. 47, t. 15; Newberry 
Bot. Williamson & Abbott's Rep. p. 33, f. 10. Р. Mexicana, Moric. Р. Californica, Benth. 
Borders of streams near San Diego, etc., California; Parry. Guadalupe Cañon, Sonora; 
Thurber. A large tree, sometimes 50-60 feet high. Hartweg states that in dnd he has 
