316 Rhus glabra ab Edward L. Greene revisa et in species novas atque usw. 
petiolulate, oblong-lanceolate, 6—10 cm long, with about 11 serratures 
on each margin and a short triangular-subulate point, texture subcoria- 
ceous, upper face dull deep green and transverse-rugose, lower fairly 
glaucous but not white; panicle rather oblong-pyramidal, large, 12—14 cm 
high, its branches thinly tomentulose-pubescent; drupelets many, large, 
little compressed, rather thinly plushy. 
Even in the herbarium specimens this impresses one as something 
wholly apart from any and all eastern and southern shrubs that have. 
been called R. glabra. The very stout striated, lenticellate and upright 
branches, with smallish foliage evidently more ascending than is usual 
in the genus, and the large rather narrow panicle —all these marks in- 
dicate a species, and one possibly somewhat local about Lake Michigan. 
The type specimens, all in Herbarium Field Museum, are from Hinsdale, 
a suburb of Chicago, and were collected October 12, 1902, by Ernest 
C. Smith, no. 577. I also refer here without hesitation Mr. O. E. Lan- 
sing’s no. 1111, as in Herbarium Field Museum, from West Pullman, 
Ill., September 8, 1900. 
Later than all these are specimens sent me late in August, 1906, 
from near Nashotah, Wisconsin, by Dr. H. V. Ogden of Milwaukee. 
These came to hand after the above diagnosis of R. valida bad been 
finished, and the type specimens returned to the Field Museum. But 
they answer perfectly to my description of the species in every part- 
icular, and therefore only further confirm it while extending its range. 
12. Rhus longula E. L. Greene, |. c., p. 186. 
Stem and branches not known; leaves about 3 dm long, with long 
stout ascending petiole, and 13 or 15 approximate leaflets, these 7—9 cm 
long, sessile by a rounded base, the apical acumination short though 
slenderly attenuate, the margins lightly and almost subcrenately serrate 
with about 11 or 12 serratures, texture firm, hardly subcoriaceous, color 
dark dull-green above, whitish-glaucous beneath; fruiting panicle narrowly 
oblong and greatly elongated, 18 cm long, hardly 5 cm wide at the 
widest part, the short branches hirtellous-tomentulose; drupelets of middle 
size and numerous. 
Bluffs of the Mississippi River far northward; -the special station 
for the type somewhere near Stockton Minnesota; the type specimen 
in U. S. Herbarium, John M. Holzinger, August 23, 1888. May, 1889. 
That R. longula, away at the western North should flower in May is 
noteworthy; for its ally," R. glabra, so far southward as the valley of the 
Potomac does not begin to flower until July. 
The eastern analogue, R. ithacensis, in Pennsylvania, does not come 
into flower before the end of July or early August. These segregates 
of R. glabra from the northwest, by their almost vernal flowering, reassert 
for themselves a more distant relationship to the eastern types than that 
which we should infer from their visible characters alone. 
