SEED-BEARING PLANTS 465 
stamens by petal-like organs (Fig. 346). Not that 
stamens are "transformed into petals," as is often stated, 
but that petal-like organs appear at the points where 
stamens normally occur in the wild form. In other words, 
the supernumerary petals are homologous with stamens. 
FIG. 348. Petalody of stamens in a cultivated rose, a, indicates the 
remains of anthers on petal-like organs that have replaced stamens. 
This homology is made clear by transitional forms, show- 
ing all gradations between true stamens and normal 
petals (Figs. 348 and 349). 
By comparing the methods of doubling the flower in 
the buttercup and the rose, we see that double flowers may 
be produced by either (or both) of two methods, often 
3 
