92 
PLANTS OF YELLOWSTONE NATIONAL PARK 
Pachylophus caespitosus. —The leaves which are all basal, are 
lance-shaped, nearly entire or somewhat toothed and narrowed at 
the base into long, winged 
petioles. The sweet-scented 
flowers are very large, 2 
or 3 inches broad, and the 
petals are white with yel¬ 
lowish veins but become 
red or pink as they mature. 
Taraxia brevvflora dif¬ 
fers from the above in hav¬ 
ing small flowers with only 
one stigma. The leaves 
are all basal and pinnately 
lobed, the lobes 1- or 2- 
toothed or entire. The 
leaves are short-hairy. The flowers are white or yellowish, and the 
mature capsule is deeply four-grooved. 
Taraxia subacaulis differs from 
the preceding species in not being 
hairy, in having the leaves entire 
or nearly so, and in the capsules 
being without grooves. 
Gayophytmn ramosissimmn is a 
low, slender, much-branched plant 
with tiny white or pinkish 
flowers. 
Gayophytmn caesium is very 
similar, differing primarily in 
having the fruits sessile or on 
very short stalks. 
Gayophytmn diffuswn has 
larger flowers, about a quarter of 
an inch broad. 
Gaycphytum pumilum has also 
been reported as occurring in the 
park. 
Gaura parviflora is a perennial 
plant with much-branched stems, 
narrow, alternate leaves, and yel¬ 
lowish flowers in the axils of the 
leaves. The fruits differ from 
those of other members of the 
family in being nutlike, and they do not open at maturity as do the 
fruits of the others. 
Figure 69a.—Fireweed. Scarlet to pur¬ 
plish. Copyright, J. E. Haynes. 
Figure 69.—Fireweed. Scarlet to purplish. Photo¬ 
graph by Joseph S. Dixon, National Park Service. 
