OF THE COROLLA. 251 
Phyllody of the corolla——'T'he petals also are frequently 
replaced by leaves, though in many of the recorded 
instances the change has been one of colour only; 
these latter are strictly cases of virescence. M. Seringe! 
speaks of a flower of Peltaria alliacea in which the 
calyx was petal-like, while the corolla was leafy as if 
there had been transposition of the two organs, a very 
rare, if not unparalleled, instance. In a flower of 
Campanula Mediwm, provided, as is often the case, 
with a double corolla, the outer corolla was slit down 
on one side, the edges of the cleft being leafy. 

Fig. 133.—Sepals and petals to leaves. Geranium. 
The frondescent petals are very often completely dis- 
joined, as in Verbascwm nigrum, and Lonicera Peri- 
clymenum, 1 which, moreover, median prolification 
generally coexists. In the case of Tropeolum majus, 
the ordinary leaves of which are peltate and orbicular, 
the petals when frondescent have not the peltate 
arrangement, but are spathulate, and provided with 
very long, narrow stalks, so that, in some cases, they 
are, more properly speaking, enlarged virescent petals 
than true leaves; in other instances, however, the 
arrangement of the ves is more like that of the true 
leaves than that of the petals. 
As might be expected, frondescence of the petals is 
frequently accompanied by other changes of a similar 
nature in other parts of the flower, and sometimes by 
the abortion of the sexual organs. Thus, in Actea 
spicata, as observed by Fresenius, the petals were 
replaced by true petiolate, palminerved, lobed leaves, 
' «Bull. Bot.,’ i, p. 6. 
