140 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Rance: Alpine or subalpine on the mountains of north central Colorado as far 
south as Pikes Peak. 
REFERENCES: Rydb. Contr. U.S. Nat. Herb. 3: 482.1896, a valuable article, giving 
figures of A. brevistyla and A. saximontana, and discussing the relationships of the 
species of this group. Rydb. Colo. Agr. Exp. Sta. Bull. 100: 136.1906. A. Nels. 
in Coulter, New Man. Rocky Mount. 192. 1909. 
SPECIMENS EXAMINED. 
Cotorapo: West of Cameron Pass, Larimer County, Crandall 1885. Flat Top, Estes 
Park, Osterhout 789. Bottomless Pit, near Pikes Peak, Clements 511, 528. 
Mountains of Estes Park, Osterhowt 2827, 3121, Johnston 369. Twin Sister 
Mountain, Estes Park, Cooper 7. Argentine Pass, Jones 875. Foot of Grays 
Peak, Shear 4632. Near Georgetown, Marsh. Mount Princeton, Sheldon 331. 
A rare species, allied to A. laramiensis A. Nels. and A. brevistyla Hook., but appar- 
ently intergrading with neither. Unique in the genus because of its total lack of 
pubescence. 
4. Aquilegia laramiensis A. Nels. First Rep. Fl. Wyo. 18. 1896. 
Stems many from a rather large root, 10 to 20 cm. high, more or less decumbent 
and diffuse, sparingly pubescent; basal and larger stem leaves biternate, the leaflets 
short-petioluled, broadly obovate, large (for this group), 20 to 28 mm. long, thin, 
glaucous and sparingly pubescent beneath, the lobes obtuse and rounded, none 
of the leaflets simple; flowers 1.5 to 2 cm. long and about as wide, exceeded by the 
leaves, nodding; sepals greenish white, lanceolate, acute, 10 to 15 mm. long, exceed- 
ing the lamine by 1 to 3 mm., slightly spreading; lamine cream-colored, oblong, 
obtuse, 10 to 12 mm. long; spurs white, incurved or hooked, 5 to 7 mm. long; styles 
about 5 mm. long; ovaries pubescent; follicles 5, 1 to 1.2 cm. long, the tips slightly 
spreading. 
TyPE LocaLity: Cottonwood Canyon, Albany County, Wyoming. 
Rance: Albany County, Wyoming. 
REFERENCE: A. Nels. in Coulter, New Man. Rocky Mount. 191. 1909. 
SPECIMENS EXAMINED. 
Wyomina: Cottonwood Canyon, Nelson 1581 (type). Ragged Top, Nelson 8232. 
Antelope Basin, Nelson 7505. 
An apparently distinct and most interesting species, collected by Dr. Nelson in 
practically but one locality in Albany County, Wyoming, where it grows in rock 
crevices or beneath overhanging ledges at an altitude of less than 2,100 meters. It 
is to be distinguished from A. sarimontana, to which it is closely allied, by its longer, 
more diffuse stems, its much larger, thinner leaflets with scanty pubescence, and its 
white flowers and longer styles. 
5. Aquilegia flavescens §. Wats. in King, Geol. Expl. 40th Par. 5: 10. 1871. 
Aquilegia canadensis aurea Roezl; Regel, Gartenflora 21: 258. pl. 734. 1872. 
Aquilegia caerulea flavescens Lawson, Proc. & Trans. Roy. Soc. Canada 24: 76. 
1885. 
Aquilegia depauperata Jones, Contr. West. Bot. 8: 1. 1898. 
Aquilegia caerulea flavescens Jones, Contr. West. Bot. 8: 2. 1898. 
Aquilegia canadensis flavescens Davis, Minn. Bot. Stud. 2: 335. 1899. 
Aquilegia formosa flavescens Frye & Rigg, Northw. Fl. 165. 1912. 
Stems 30 to 60 cm. high, usually pubescent; basal leaves biternate, the leaflets 
rather large, glabrate or finely pubescent, glaucous beneath; flower 3 to 3.5 cm. long, 
3.5 to 4 cm. across, nodding, yellow throughout; sepals occasionally tinged with red, 
ovate-oblong, spreading or reflexed, 20 to 25 mm. long, exceeding the lamine about 
10 mm.; lamine broadly rounded, 7 to 9 mm. long; spurs stout and usually more or 
