FAMILIES OF PLANTS 75 
ceding species but while the calyx is dark or purplish green the 
petals are yellow and the styles are not feathery. 
American strawberry [Fragaria americana) .—The plants resemble 
those of the cultivated strawberry. They are low plants that spread 
by runners and have no upright stems except those that bear the 
flowers. 
Fragaria platypetala is similar, but the whole plant including the 
flowers and fruits is larger. 
Figure 54.—Whiteflowering raspberry. White. Photograph by Joseph S. Dixon, National 
Park Service. 
Fragaria ovalis is most readily distinguished from the other two 
species by the fact that the hairs are closely appressed to the stems 
and leaves instead of spreading. 
Drymocallis convaTlaria is a perennial herb with pinnate leaves and 
white flowers. It is more or less covered with long hairs and is some¬ 
what sticky on the upper portions. The stem is 15 to 30 inches 
high. The basal leaves have long petioles and 9 to 11 toothed leaflets. 
Drymocallis pseudorup\estris is similar, but the stems are only 8 to 
15 inches high, and the basal leaves are short-petioled and have 7 
to 9 leaflets. There are only a few stem leaves each with 3 to 5 
leaflets. 
