130 ALTERATION OF POSITION. 
from the ovary, is but rarely changed in a prolified 
flower; but that this is not a universal rule is shown 
by proliferous flowers of Gewm vrivale, where the sepals 
are usually large and leaf-like, as they likewise are 
frequently in proliferous roses and pears. 




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Fie. 64.—Proliferous rose. Hip absent, sepals leafy, stamens wanting, 
axis prolonged bearing supplementary flower, &c. (Bell Salter). 
Proliferous roses have a special interest, inasmuch 
as they show very conclusively that the so-called calyx- 
tube of these plants is merely a concave and inverted 
thalamus, which, in prolified specimens, becomes elon- 
