iqiq] SARGENT— north AMERICAN TREES 215 



Staminate aments densely flowered, 5-6 cm. long, puberulous, the 

 bract of the flower broadly obovate, laciniate; anthers 10 or 12; 

 aments of pistillate flowers villose, 6-7 cm. long, becoming at matu- 

 rity 15-16 cm. in length. Disk of the flower broad, entire or erose 

 on the margin; ovary broad, ovate, puberulous; stigma 3-lobed 

 or occasionally 2-lobed. Fruit broadly ovate, rounded at apex, 

 slightly pitted, puberulous, thin-walled, inclosed sometimes for 

 one-third of its length in the enlarged disk, 5-6 mm. long, often 

 abortive; pedicels puberulous, 2-2.5 mm. in length; seeds narrow- 

 obovoid to ellipsoidal, 3 mm. long. 



A large tree with deeply furrowed bark, wide spreading branches, slender 

 glabrous branchlets reddish brown in their first season, light orange-brown in 

 their second year, and acuminate, lustrous, glabrous winter-buds. 



Streets of San Bernardino, San Bernardino County, California, C. C. Parry, 

 March and April 1883 (type), C. S. Sargent, March 16, 1916, 5. B. Parish, 

 October 15, 191 7; along Cottonwood Creek, west side of Owen's Lake, Inyo 

 County, California, F. V. Coville and F. Funston, June 19, 1881 (no. 996); in 

 the Canoda de las Uvas, about 2 miles north of Fort Tjon, Kern County, 

 Cahfomia, F. V. Coville and F. Funston, July 5, 1891 (no. 1163). 



These trees appear intermediate in character between P. Fremontii and 

 P. trichocarpa. The leaves resemble in shape those of the common Californian 

 form of P. Fremontii, but are silvery white below like those of P. trichocarpa 

 and the other balsam poplars, and their serration is much finer than that of 

 the leaves of P. Fremontii, but coarser than that of the leaves of P. trichocarpa. 

 The staminate flowers have fewer stamens than those of either of the supposed 

 parents; the disk of the female flowers is very similar to that of both of them, 

 but the ovary, which is glabrous in P. Fremontii and densely tomentose in 

 P. trichocarpa, is pubescent. Parry, who first noticed this tree and who would 

 have considered it a new species if he had seen it growing wild, thought that 

 it might have been an exotic species introduced into San Bernardino. The 

 leaves on the specimens of the wild plants from the western base of the Sierra 

 Nevada are similar to those of the San Bernardino trees, but the fruit is rather 

 longer and more acute. Of these specimens Coville wrote me November 4, 

 1892: "I send you by mail specimens of a poplar collected along streams flow- 

 ing from the southern Sierra Nevada. Specimens of P. Fremontii, P. tremu- 

 loides, and P. trichocarpa were collected by the Expedition (Death Valley), and 

 these specimens show characters between P. Fremontii and P. trichocarpa.'' 



OsTRYA viRGiNiANA K. Koch.— The variety of this tree, on 

 which the branchlets, petioles, and peduncles are covered with 

 short erect glandular hairs, may be distinguished as 



