104 
PLANTS OF YELLOWSTONE NATIONAL PARK 
Gilia tenerrima is similar, but the petals are white and twice as 
long as the calyx. 
WATERLEAF FAMILY (HYDROPHYLLACEAE) 
The waterleaf family is of little economic importance except for 
the ornamental flowering plants that it contains. Its members are 
mostly herbs with regular flowers having a numerical plan of five. 
Both the calyx and corolla are tubular and bell-shaped, and the five 
stamens are attached to the corolla-tube. There are two styles, 
but in some cases they are completely united into one. The fruit 
is a dry capsule. 
Waterleaf (Hydrophyllum capitatum ).—The plant has a cluster of 
stems 4 to 8 inches high and one to several leaves. The whole plant 
is more or less covered with white, 
stiff hairs. The leaves are pin- 
nately divided into 3 to 5 divi¬ 
sions which may be entire or 2- or 
3-lobed. The flowers are blue and 
are borne in a dense, headlike 
cluster. 
Nemophila breviflora is a slen¬ 
der annual herb with weak, al¬ 
most trailing stems and mostly 
alternate leaves which are pin- 
nately divided into 3 or 5 lobes. 
The flowers are white or whitish 
and solitary. The calyx is 5-lobed 
and has in each sinus a small ap¬ 
pendage which is bent back. The 
corolla is also 5-lobed and has 10 
small appendages at the base in- 
Figure 81.—P hacelia. Blue-violet or 
whitish. Photograph by Joseph S. Side. 
Dixon, National Park Service. Phacelia and Fiddleneck (Phace¬ 
lia ).—Mostly hairy plants with alternate leaves and showy, usually 
lavender or purple flowers. The flowers are clustered in spikes or 
racemes, and the stamens usually project far out of the flower, giv¬ 
ing a fringed appearance. The four species that have been identified 
in the park may be distinguished as follows: 
1. Leaves mostly entire. 2. 
1. Leaves pinnately divided. 3. 
2. Leaves mostly sessile, linear to lance-shaped, green. Flowers violet or whit¬ 
ish. Phacelia linearis. 
