166 AMERICAN MIDLAND NATURALIST. 
to the latter. With white forms occasionally observed in 
Colorado amidst typical plants and the reverse obtaining in 
. Utah, no definite specific line can possibly be drawn between 
the two forms, so Doctor Gray’s name is not only appropriate 
for the Utah form but it is also indicative of its relationship 
to A. coerulea. The forms appear to thrive best in the Aspen 
region. 
On June 27, 1909, while riding over the Kaibab Plateau 
from Ryan, Arizona, to the Grand Cafion, I observed a very 
graceful form of an Aquilegia hitherto unknown to me. It is 
frequent in the vast Pinus ponderosa area for which the pla- 
teau is famous; its position in the system appears to lie be- 
tween the A. coerulea group and A. chrysantha. To the form- 
er it is related by its sometimes faintly bluish sepals while 
the long and very slender spurs remind one of A. chrysantha. 
The latter species I collected in April, 1908, on a similar yel- 
low pine (Pinus ponderosa Mayriana) area in the Huachuca 
Mountains, Arizona. 
Aquilegia pinetorum nov. sp. 
In A. ehrysantha the length of the sepals to that of the 
spurs may be expressed by the ratio 7:11, while in the new 
form the relation is 3:7, or, reduced to a common denomina- 
tor, the relations will be expressed by 6:10 and 4:10 re- 
spectively. In A. coerulea the relation is 7:10. It is true 
that the length of the spur in A. chrysantha, and for that 
matter in many if not in all of the “spurred” species, is a 
variable quantity; yet the differences are too great to allow 
our form to be referred to either A. coerulea or A. chrysantha. 
The petals in A. chrysantha are commonly 12 mm. in len 
(excluding the spurs), m a rounded or broad and some- 
what truncate apex. In our form, on the other hand, the 
petals approach more rofa the form and size of those of 
A. coerulea. The piel s diagnosis will serve to further 
elucidate bis specie: 
Her a perennis, 4 dm. altior: caules pauci e caudice 
sim supra ramosi, Ble sales v. glabori: folia basilaria 
erosa, 2-ternata; petioli graciles, 10-15 cm. longi, basi 
dilatati. petioli secundarii paene filiformes, 1-4 cm. longi, 
petioluli filiformes, 0.5-1 cm. longi, pubescentes; foliola 
fida, segmentis el dotada oto Lis basi rotundata v. 
cating supra viridia subtus glaucescentia ; caulinia minora 
ternata, simpliciora: flores magni (A. coerulea minores) 
albi; sepala oe acuta, basi contracta, 3 cm. plus 
minusve longa, alba v. saepe coe oerulea ; petala spatulata, apice 
ps, calcaribus pectin. tenu ibus, 7 cm. plus minusve 
longis; s petala superantia, inaequalia, antheris oblon- 
