466 



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 latijolius). 



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: 



