360 Rhus glabra ab Edward L. Greene revisa 
dately acute rather than acuminate, evenly but not deeply serrate, the 
serratures 10—12 on a side, upper face of a lightish green but some- 
what polished, the lower only pale, not whitened; fruiting panicle small, 
only about 8 em high, definitely pyramidal, its branches short, sparsely 
hirtellous; drupelets immature but perhaps full grown, orbicular, or a 
little broader than high. 
At 6000 feet in the mountains near Provo, Utah, July 10, 1894, 
Marcus E. Jones, in the National Herbarium. This differs. from all other 
far-western species in that its foliage is almost as highly polished as that 
of R. copallina. 
19. Rhus tessellata E. L. Greene, l. c., p. 191. 
Shrub low, copiously and densely leafy, the leaves rigidly ascending, 
about 2,5 dm long, the pinnae approximate: leaflets about 15, lance- 
oblong, 5—7 cm long, not quite sessile, cuspidately acuminate, evenly 
and quite sharply serrate, the serratures 13—17 on a side, the texture 
subcoriaceous even at flowering time, upper face very smooth and some- 
what shining, in general dark green, showing very prominently the fine 
whitish midvein and veiniets, but some intervals between veinlets wholly 
of a light green, exhibiting the whole surface as notably checkered. 
lower face merely pale and glaucescent, not glaucous; panicle small for 
the foliage; fruit not seen. 
Foothills of the Rocky Mountains in northern Colorado, at alti- 
tudes of 6000 to 7000 feet; type specimen in U. S. Herbarium, J. H. 
Cowen, July 20, 1895; no special locality mentioned. The species by 
leaf characters alone is a very good one, even if the checkering of dark 
and light green be but accidental or occasional. . The species here defined 
may or may not include all the so-called R. glabra of eastern Colorado 
mountains. 
20. Rhus arguta E. L. Greene, |. c., p. 192. 
Shrub said to be 1—3 m high, the branches stoutish, smooth. 
glabrous, glaucous even in full maturity; leaves notably ascending rather 
than spreading, 3 dm long, the petiole uncommonly elongated and, like 
the rachis, very glaucous; leaflets 17 or 19, narrowly oblong-linear or 
subfalcate, 6—8 cm long, sessile by an acutish base, closely, sharply 
and saliently serrate, the serratures 15 or 16 on a side, the acumination 
long and narrow, upper face deep green but dull, the transverse veins 
conspicuously paler, lower face very glaucous; panicle not large, 10 to 
12 cm high, pyramidal, its branches hirsutulous; drupelets of the largest. 
Species of the Pacific slope, apparently common in the Columbia 
River region, at least eastward; very possibly an aggregate, resolvable 
into several: but the type of the above diagnosis is from Rhea Creek, 
Morrow County, Oregon, and was collected by J. B. Leiberg. Sep- 
tember 11, 1894, in U. S. Herbarium. The following, all from western 
Washington, are more or less true to this type: in Herbarium Field 
Museum, from near Spokane, in flower only; from the same region with 
