SEGREGATES OF RHUS. 119 



the upper face glabrous, the lower also except a few hirsute hairs 

 along the larger veins : fruits large but not of the largest, dis- 

 tinctly round -oval, 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. 341 from Wenatchee, Washington, 16 Aug. 

 1896, as in U. S. Herb. When T. Rydbergii 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 as in 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 T. 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 genei-al 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. LOBADioiDBS. 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, 1} to 2 inches long, 1 to 1} 

 inches wide in the middle, dark green and with scattered ap- 

 pressed hair-points above, beneath paler and more or less hairy 



