96 
PLANTS OF YELLOWSTONE NATIONAL PARK 
4. Style turned down. 5. 
4. Style straight. 6. 
5. Leaves mottled with whitish spots. Whitevein pyrola {Pyrola piota ). 
5. Leaves not mottled. Pyrola dhlorantha. 
6. Flower cluster one-sided. Style long. Sidebells pyrola (Pyrola secunda). 
6. Flower cluster not one-sided. Pyrola minor. 
INDIAN PIPE FAMILY (MONOTPOPACEAE) 
A family of plants without green leaves and with flowers that re¬ 
semble in structure those of the 
plants do not have green leaves, 
Figure 72. —Whitevein pyrola. Greenish 
white. Copyright, J. E. Haynes. 
wintergreen family. Since these 
they cannot manufacture starches 
and sugars as a green plant can 
and must depend upon some other 
organism for these foods. In 
most cases they obtain these 
foods directly from fungi, as 
parasites. 
Figure 73. —Pinedrops. Whitish. Photo¬ 
graph by A. R. Sweetser. 
Pinedrops (Pterospora andromedea) produces an unbranched and 
rather stout, purplish-brown stem, usually from 1 to 3 feet high, 
and bearing numerous, narrow scales and many whitish flowers, each 
nearly half an inch long. The plant is found in rich coniferous 
woods. 
Pinesap (Hypopitys multiflora) is usually less than 6 inches high 
but may become as much as a foot high. The whole plant is white 
