et in species novas atque affines divisa. 361 
lax pyramidal panicle very much larger, leaflets larger, greener on both 
faces and by no means sharply serrate; A. D. E. Elmer, Wawawai, 
1897; Frank Kreager, Spokane County, 1902; Sandberg & Leiberg, 
Rock Island, 1893, and Robert Horner, Waitsburg, 1897, these last all 
as in U. S. Herbarium, likewise from Idaho, A. A. Heller, Nez Perces 
County, 1896, no. 3421. This is quite true to the type as to foliage, but 
in flower only: a fruiting specimen, from Salmon River, Vernon Bailey, 
1895, with leaflets not so typical. - 
Among all these there is nothing of Torrey's Rhus glabra var. occi- 
dentalis. Nearly all that I have seen of Pacific coast material which 
matches that of the Wilkes Expedition, comes not from Oregon or 
Washington, but from British Columbia. 
21. Rhus aprica E. L. Greene, l. c., p. 193. 
Dimensions of shrub, and characters of branches unknown; leaves as 
à whole remarkably broad and short, the leaflets being few and approxi- 
mate but large, subcoriaceous, deep green above, light green beneath, 
but without bloom; leaflets about 15, oblong, 6—8 cm long,. obtuse at 
base and sessile, at apex only cuspidately acute, not acuminate, very 
evenly and quite distinctly though not sharply serrate, the serratures 
10 or 11 on each margin: panicle pyramidal, small, about 8 em high, 
its branches only sparingly and obscurely villous-pubescent; drupelets 
rather large. 
Very well marked by its few and large leaflets green on both faces; 
but known only as collected by M. W. Gorman, no. 632, on Camas 
Creek in the Washington State Forest Reserve, August 20, 1897. It is 
said to occupy dry open grassy slopes. The type specimen is in U. S. 
Herbarium. 
22. Rhus occidentalis (Torrey) E. L. Greene, l. c., p. 193. 
Rhus glabra occidentalis Torr. in Bot. Wilkes Exp., 257, 1874. 
23. Rhus albida E. L. Greene, |. c., p. 194. 
Probably low, the branches not robust, very light-colored and, with 
the rachis and lower face of leaves, much whitened with bloom, even 
the upper face of foliage of a pale color and glaucescent; leaves 1,5 to 
2.5 dm long: leaflets about 13, not crowded, not deflected but spreading, 
subsessile, 4- 6 em long, oval to oblong-lanceolate, abruptly acute or 
short-acuminate, saliently serrate, the serratures 10—14 on each side; 
fruiting panicle about 1 dm high and quite broadly pyramidal, its bran- 
ches only very delicately but rather densely velvety; drupelets much 
compressed and acutish. 
As far as known this very beautiful Rhus is local on the San Fran- 
cisco Mountain not far from Flagstaff in northern Arizona. The type 
speeimen in the National Herbarium, at an altitude of between 6000 and 
1000 feet, August 18, 1901, by J. B. Leiberg, no. 5871. A perfect male 
flowering specimen is in my own herbarium, as collected by myself at 
the same station, July 13. 1889. A flowering branch from the same 
Repertorium novarum specierum. 24 
