1915] PAYSON—COLORADO PLANTS 375 
SALIx.—Nos. 288 and 289, collected in flower near Naturita 
on May 9g, 1915. The stamineal filaments are united nearly to 
the summit in these specimens. If it were not for this char- 
acter, I would refer this willow to S. cordata Muhl., but because 
of knowledge of material from one plant only and the lack of 
mature leaves, I prefer to leave it undetermined for the present. 
ERIOGONUM MICROTHECUM Nutt.—Collected near Naturita, 
September 26, 1914, on a dry rocky hillside; no. 613. 
PoLYGOoNUM AMPHIBIUM L.—A form of this species with long 
fringed sheaths is common in ponds on the Uncompahgre Divide 
in Tabeguache Basin; no. 173. 
Aquilegia pallens, n. sp.—Perennial: stems slender, erect, 
glandular, pubescent, and sparsely villous throughout; radical 
and lower cauline leaves biternate; petioles slender, only somewhat 
glandular, moderately villous, much exceeding the rest of the leaf; 
leaflets rather thick, broadly cuneate to suborbicular, base often 
quite truncate, margins inclined to be revolute, under surface 
slightly glaucous, more viscid and hairy than upper one; upper 
cauline leaves once or twice ternate, only the few small floral 
bracts entire: flowers about 3 cm. in diameter and 5 cm. long, 
mostly erect; sepals 15 mm. long, white or pale blue, lanceolate 
with narrow claw; petals white, blades about 8 mm. long and 6 mm. 
broad, truncate, spurs straight, about 3 cm. long; stamens exceed- 
ing the petals and exceeded by the mature styles; ovaries pubes- 
cent: mature fruit unknown. 
Collected only in the canyon of La Sal Creek, Utah, within a few miles of 
the Colorado boundary, at an elevation between 6500 and 7oooft. The plants 
were growing in a moist area at the foot of the sandstone walls of the canyon. 
The slender stems, the thick leaves, the viscid and villous herbage to which 
grains of sand were clinging, ant the ae white or a ase _— flowers gave 
this plant of the Upp m A. coerulea 
of alpine and sihalsine stations to which it is evidently related. No. 443, 
June 16, 1914. 
Cleomella montrosae, n. sp.—Glabrous annual, 8-15 cm. high, 
from a slender taproot: stem diffusely branched from base: leaves 
trifoliate; petiole 2-3 mm. long; leaflets linear-oblong, 10-14 mm. 
long, thickish, distinctly petiolulate, more or less folded and with 
