OTHER YELLOW FALL FLOWERS 65 
Cup-plant.—The cup-plant (Silphium perfoliatum), also 
called rosin weed, is a common roadside plant in the Middle West. 
The illustrations showing the flowers and also the plant give a 
A 
Fie. 31.—Blossoms of the cup-plant. 
good idea of its appearance. By looking closely at Figs. 30 and 
31 it will be seen that the stem is square, and that the leaves 
are grown together at the base, thus making a cup around the 
stem, from which the name is derived. These plants are abund- 
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