The American Midland Naturalist 
PUBLISHED BI-MONTHLY BY THE UNIVERSITY 
OF NOTRE DAME, NOTRE DAME, INDIANA 
Vol. I. APRIL, 1910. No. 7.* 
Species of Aquilegia Growing in Utah and in Adjacent 
Portions of Colorado, Idaho and Arizona. 
IVAR TIDESTROM. 
During the seasons of 1907- 09, while botanizing on the 
Uncompahgre Plateau, Western Colorado, in the Wasatch 
Mountains, Central Utah, and on the Kaibab Plateau, North- 
ern Arizona, I collected a number of Aquilegiae, which proved 
of particular interest especially so far as the distribution of 
the species is concerned. Of the species listed by Dr. Rydberg 
E Colorado, I observed particularly A. coerulea, A. elegan- 
and A. micr antha. 
rst Dentin appears to be not only the most wide- 
ly distributed species but has also the distinction of being the 
tate flower of Colorado. It occurs throughout Colorado at 
the higher elevations, usually at 2400 m. and upwards and is 
very abundant in places on the Uncompahgre Plateau, where 
I have observed it. This handsome species was first mention- 
ed by James (Long’s Expedition, 2:15, 1823) and later de- 
scribed by Doctor Torrey (Ann. Lye. N. Y. 2:104; 1828). Tt 
is readily recognized by its large bi-colored Era s e 
sepals being light blue, the uie ey E wh It 
illustrated by Hooker (Bot. Mag. 90:t. 5 1 1964). and is ‘too 
well known to require a description here 
n the Wasatch Mountains we find a white form growing 
dier: practically the same conditions as the Colorado plant 
and differing in no particular from the latter except in the 
color of the sepals. It was first noticed by Nuttall and des- 
cribed by him under the name A. leptocera (Nutt. in Journ. 
Acad. Se. Phila. 7:9, 1834) and also illustrated by Hooker 
PUE joined t. ient 1848). It was described by Doctor Gray 
as oerulea vV albiflora (Robinson, Gray Syn. Fl. 1:44 
1885). At first E thought the Utah form coat pactado 
as a species but on August 27, 1908, while botanizing on the 
slopes of Mount Terrell, Central Utah, I met with typical A. 
coerulea growing with the typical Utah form and varying in- 
* April 15, 1910.—Pages 165 to 196. 
