60 
PLANTS OF YELLOWSTONE NATIONAL PARK 
American pasque flower ( Pulsatilla hirsutissima) .—This is the State 
flower of South Dakota. The general characteristics are the same 
as those of the anemone except that the styles become long feathery 
Figure 42. —Sugarbowl. Seeded. Purple. Photograph by Dr. Harvey E. Stork 
tails on the fruits, and the purplish flower is somewhat more cup¬ 
shaped. 
Columbia clematis ( Clematis columbianum) .—-This is the plant that 
gives the name to Clematis Gulch at Mammoth Hot Springs. The 
four sepals are violet or purple and 1 to 2 inches long. There are no 
Figure 43.—Water crowfoot. White. Photograph by Dr. Harvey E. Stork 
petals, but often some of the outer stamens are more or less petal¬ 
like. The leaves are compound with three leaflets, and the stems 
climb by means of the twisted petioles. 
Western virginsbower ( Clematis ligusticifolia) , which climbs over 
bushes and produces an abundance of small, white flowers, and 
Sugarbowl ( Clematis douglasii ) which is an erect plant and has flow¬ 
ers with four very thick, deep purple sepals, also occur in the park. 
