PETALODY. 283 



the flower to sepals have occurred in monocotylodonous 

 plants, or others in which the calyx and corolla are of 

 the same coloui', 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 th^ calyx in certain instances is naturally coloured, 

 as in Delphinium, IVopceolum, and others. In Miis- 

 scenda, Calycopliyllum, JJsteria, &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 MimuluSf in which plant, as the calyx is permanent 

 while the corolla is deciduous, the coloured calyx is a 

 great advantage in a horticultural point oi 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 



' BuU. Acad. Belg.,' xix, part 2, p. 93. 



