(188 ) 
Bis 
ground the colonies are more irregular and shrub-like. 
When the leaves unfold in the spring the contrast betweefi 
the\clumps of the different species or subspecies, as you 
may ‘gall them, is best shown, as one clump is bright red, 
while the next may be yellowish or gray. One of theg Fellow 
forms I ‘afterwards identified as 2. Gambeliz Be fand the 
gray one 1&2. Hendlerz Liebm. 
In the Sot Cheyenne Cajfion, near Coloradg 4 Springs, in 
Wahatoga Calign between the two Spanish g jpeaks and on 
Turkey Creek, a“tributary of Huerfano Rivegs we also found 
oaks but of a differaé nt habit, viz., solitary, ny ‘ddle-sized trees, 
that could scarcely Be referred to 2. Ggmbeliz. Those of 
the last locality, at lea&, were so unlikegany of the forms in- 
cluded in 2. Gambeliz, hat I immedigtely regarded them as 
belonging to an undescrit ped specigs; the thin leaves and 
general habit suggest rathe&2. migor. 
When I left I instructed M&, Vieeland to collect acorns in 
the fall. He has sent me specighens of three or perhaps four 
distinct forms of the 2. Gamée ; series. We may call them 
species or varieties just as we ’ plek se, but they look very dif- 
ferent in the field—more soghan in ht barium specimens. Be- 
sides these I had notes gid material4gathered by myself in 
1895, by Dr. Fred. @lements, of N@braska, and Mr. E. 
A. Bessey, of Washi¥ Acton, D. C., in tf e years 1896-1900, 
and of course the gpecimens in the herbi , ia of New York 
Botanical Garde And Columbia University I found, how- 
ever, that thesef collections were not sufficient to make a 
thorough studyfof the oaks of the southern Rockies. I wrote 
to the Missoyfi Botanical Garden and the United States Na- 
tional Herbarium, asking for the loan of their specimens of 
Q. undulgia, 2. Gambelii and related species. “(hese re- 
quests were kindly granted. * 
My fi inal intention was to confine my study to fhe oaks 
of thé Rockies proper, but I found that in order to reach a 
satigtactory understanding of these, it was necessary tdhtake 
inj consideration the nearly related forms of the plains and 
table-lands of Arizona, New Mexico and western Texas. I 
