154 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Miss Eastwood says that this plant has been seen in but one nichelike cavern, where 
the sun never comes and where the supply of water is so slight during the hot, dry 
summer that it is forced to cling close to the damp rocks, even climbing up the 
sides of the cave with its slender, threadlike stems. While the species has been 
found in only one locality, the subspecies is said to be common in the canyons of 
the San Juan River system in southwestern Colorado and southeastern Utah at alti- 
tudes of less than 2,100 meters. 
After this species was discovered (in 1891), Mr. Jones! made the section Pseud- 
aquilegia to contain it, based on its spurless flowers and triternate leaves. Later, 
when the subspecies was found (in 1894), Miss Eastwood made the characterization of 
this new section to read, ‘‘leaves triternate, spurs irregular or abortive, flowers small,” 
There seems to be no occasion to consider this species as representing a new section. 
Triternate leaves are known to occur in at least two sections of the genus and the 
character of the spur does not appear to be significant of more than specific individ- 
uality. On the other hand, its erect, white or cream-colored flowers, its comparatively 
large, dilated lamine, its outwardly curved, rather than hooked, slender spurs, and 
even its fragrance, seem to ally it to the caerulea group. 
19a. Aquilegia ecalcarata micrantha (Eastw.) 
Aquilegia micrantha Eastw. Proc. Calif. Acad. I]. 4: 559. 1895. 
Differs from the species in no significant way except by the development of the 
spurs, these straight or curved outward, 12 to 18 mm. long. 
Type Locauity: Near Bluff City, southeastern Utah. 
Rance: In canyons of southwestern Colorado and adjacent Utah, in the Upper 
Sonoran Zone. 
SPECIMENS EXAMINED. 
Uran: Near Bluff City, Eastwood. Armstrong and White canyons, near the Natural 
Bridges, Rydberg & Garrett 9488. 
20. Aquilegia pallens Payson, Bot. Gaz. 60: 375. 1915. Puate 13. 
Stems tufted, pubescent, glandular, sparsely villous throughout, 30 to 60 cm. 
high; basal and lower cauline leaves long-petioled, biternate; petioles and partic- 
ularly the petiolules more or less glandular and villous with spreading hairs; leaflets 
rather small, broadly cuneate to suborbicular, thickish, glabrate or finely pubescent 
above, densely pubescent and viscid beneath; flowers about 3 cm. across, 5 cm. 
long, erect or merely inclined; sepals white or very pale blue, rather broad, mostly 
obtuse, spreading horizontally or slightly reflexed, about 20 mm. long; laminz white, 
8 to 10 mm. long, somewhat spatulate, broadly rounded or truncate at apex; spurs 
white, slender, straight or spreading, about 3 cm. long, the knob of nectary small; 
styles about 10 mm. long; ovaries pubescent and viscid; follicles less than 2 cm. long. 
TYPE Locality: Canyon of La Sal Creek, Utah, near the Colorado boundary. 
RanGE: In the Upper Sonoran Zone of western Colorado and adjacent Utah. 
SPECIMENS EXAMINED. 
Cotorapo: Near Grand Junction, Payson 712. 
Uran: La Sal Creek Canyon, Payson 443 (type). Moab, Jones. Green River, Jones. 
A relative of A. caerulea and retaining the biternate leaves of that species although 
growing in a hot, arid region. Distinguished from it by its much smaller flowers and 
the viscid-pubescent leaflets and stems, to which grains of sand may usually be found 
clinging. 
Found usually beneath cliffs where the soil is moist with oozing ground water 
in the early summer, but is quite dry later in the year. 
EXPLANATION OF PLATE 13.—Aquilegia pallens Payson. From the specimen collected by M. E. 
Jones at Moab, Utah. Slightly less than one-half natural size. 
1 Zoe 4: 259. 1893. 
