1915] PAYSON—COLORADO PLANTS 381 
bracts: flowers in a somewhat secund, interrupted thrysus, 1-2 dm. 
long; sepals lanceolate, acute or acuminate, 4-5 cm. long, with a 
rather broad membranous margin; corolla usually horizontal, 
blue, scarcely ventricose-gibbous, obscurely bilabiate, 17-20 mm. 
long, lobes subequal; sterile filament sparsely hirsute for over half 
its length, slightly dilated; anthers bearing short, stiff hairs, cells 
not confluent, dehiscent from base to apex. 
The closest relative of this species is apparently P. strictus Benth., from 
which it is easily distinguished by the shorter, broader leaves and the unusually 
small flowers for this group. Collected on high, dry mesas near Naturita, 
May 25, 1914, where it is rather infrequent; alt. about 5800 ft.; no. 348. 
PEDICULARIS CENTRANTHERA A. Gray.—Rather common among 
junipers and pifions in western Montrose County at altitudes 
from 5800 to 7ooo ft. Collected near Naturita, May 25, 1914; 
no. 345. 
CHRYSOTHAMNUS FORMOSUS Greene.—This almost unknown 
species has apparently been collected but once before, by GREENE 
near Grand Junction, Colorado, in August 1899, and has been 
omitted from recent works on the flora of this region. When 
GREENE described it he did not know the floral characters and 
therefore I append a brief description of the species. 
Low, branched from a woody base, forming dense mats 3-4 dm. 
high, branches permanently white tomentose: leaves narrowly 
filiform, somewhat revolute, tomentose but becoming greenish with 
age, 3-4.5 cm. long: inflorescence cymose, heads rather large and 
showy; involucres nearly or quite glabrous, their bracts imbricated 
in distinct vertical rows, 4—5 bracts in each row, ovate to oblong- 
linear, subacute: corollas usually five in a head, 1 cm. long, the 
pubescent tube gradually enlarging to form the somewhat inflated 
throat; tube and throat subequal, lobes short, less than 1 mm. 
long, scarcely acute; anthers equaling the corolla; style branches 
exserted, appendages subulate-filiform, three times as long as the 
stigmatic portion: pappus somewhat deciduous, dull white; achenes 
pubescent. 
Collected near Naturita, alt. 5400 ft., on red clay hillsides that were more 
or less alkaline in character; September 8, 1914; no. 605. 
