PPTALODY. 283 
the flower to sepals have occurred in monocotyledonous 
plants, or others in which the calyx and corolla are of 
the same colour, and constitute what is frequently 
termed the perianth; and as this is usually brightly 
coloured (not green) it is more convenient to group 
the metamorphoses in question under the general term 
Petalody, which thus includes all those cases in which 
the organs of the flower appear in the form of coloured 
petal-like organs, whether they be true petals or seg- 
ments of a coloured perianth. As the morphological 
difference between the organs is one of position merely, 
there is little objection to be raised to this course, the 
less so as the term petalody merely conveys an idea of 
resemblance and not of absolute identity. 
Petaloid coloration of the ordinary leaves, or of the 
bracts, is mentioned under the chapter relating to 
colour. 
Petalody of the calyx—Calycanthemy.— As with the bracts, 
so the calyx in certain instances is naturally coloured, 
as in Delphiniwm, Tropeolwm, and others. In Mus- 
senda, Calycophyllum, Usteria, &c., one or more of the 
calyx lobes become enlarged normally. Considered 
teratologically, petaloid coloration of the sepals is 
either general or partial; in the latter case the nerves 
retain their green colour longest. There is in cultiva- 
tion a variety of the primrose called Primula calycan- 
thema, in which the upper part of the calyx becomes 
coloured, so that the flower seems to have two corollas 
placed one within the other; a similar thing happens 
in Mimulus, in which plant, as the calyx is permanent 
while the corolla is deciduous, the coloured calyx is a 
ereat advantage in a horticultural pomt of view. 
Morren' says that in order to produce the fine colour 
of the calyx of Primula officinalis (var. smaragdina) the 
Belgian gardeners cut away the corolla in a very early 
stage, and that in consequence the colouring matter 
' «Bull. Acad. Belg.,’ xix, part 2, p. 93. 
