4 66 
STRUCTURE AND LIFE HISTORIES 
referred to, respectively, as "petalody of bracts" and 
"petalody of stamens." The causes of these variations 
are not known. 
FIG. 349. Wild rose. A "single" flower showing incipient doubling 
by the replacement of stamens by petals. Below, a series of transitional 
forms from stamen to fully formed petal; an., anther, or remnant of anther. 
FIG. 350. Perennial pea (Lathyrus latifolius). 
414. Leguminoseae. The legume family is the largest, 
and one of the most widely distributed of all the Archi- 
chlamydeae, and includes three sub-families, as follows: 
