SEGREGATES OF RHUS. 119 
the upper face glabrous, the lower also except a few hirsute hairs 
wlong the larger veins: fruits large but not of the largest, dis- 
tinctly round-ovyal, even almost acutish at summit, shining, striate 
but not wrinkled. 
The common, and, perhaps, the only member of this group in 
eastern Oregon, Washington and adjacent Idaho, the type being 
Kirk Whited’s n. 241 from Wenatchee, Washington, 16 Aug. 
1896, as in U. 5. Herb. When Z. Rydbergit approaches the 
dimensions of this, as it rarely does, it is readily distinguished 
by two characters of its fruits, for they are globular, not ovoid, 
and are turgid and strongly wrinkled irregularly instead of being 
smooth and striate. 
T. DIVERSILOBUM. Rhus diversiloba, Torr. & Gray, Fl. i 218. 
This represents a peculiar type of Toxicodendron belonging ex- 
clusively to the Pacific coast. The leaflets and their lobes are 
in general rounded and obtuse rather than angular and acute ; 
the panicles in the original as well asin most of the specific 
segregates, lax and pendulous, each fruit suspended on a rather 
long and slender pedicel. 
But several inland species have their panicles as rigidly 
erect as in the Atlantic type of the genus. Typical Z. diversi- 
lobum is from the lower Columbia, and is figured well in Hooker’s 
Flora. The species seems to extend along the seaboard south- 
ward throughout western Oregon and California to about Mont- 
erey, exhibiting much diversity as to the lobing of the leaf, 
though the general outline of it remains the same. But south 
of Monterey other well defined species appear, and still more of 
them away inland among the mountains bordering arid regions 
in California, Oregon and Washington. Some of these, of 
which fair specimens occur in the herbaria, are here named and 
defined. 
T. LoBaprorpes. Evidently upright, stout, not angular, the 
bark of growing branches velvety-puberulent, of the older glab 
rate, lenticellate: leaflets all round-ovate, acute, evenly serrate 
above the middle, below it entire, 14 to 2 inches long, 1 to 14 
inches wide in the middle, dark green and with scattered ap- 
pressed hair-points above, beneath paler and more or less hairy 
