PHYTOGENY. 239 



1238. Corollas which have only a single petal (the 

 tubular- shaped corollse should not be styled monopetalous, 

 but those which actually have a single petal to the 

 corolla) are indeed to be regarded for the most part as 

 an odd leaflet ; yet still much variety appears to take 

 place in these developmental arrests. Thus here no 

 division of the fibrous bundle was attained, or the lateral 

 leaflets have wholly disappeared. 



1239. In many this one leaflet also is arrested, and 

 the corolla is wholly wanting. Such a corolla is to 

 be viewed as a stem with radical, but without ramular 

 leaves. 



1240. It is not a matter of indifference whether the 

 single involucre that is left remaining be called calyx or 

 corolla ; the distinction between both is philosophically 

 correct, though at the same time also it may be fre- 

 quently difficult to determine. Colour and relation to the 

 stamina and fruit determine much ; but respect must be 

 also paid to the whole idea of the plant, whether it has 

 radical leaves or not, whether the leaf-ribs do or do not 

 ramify. Alternating stamina afford evidence of its being 

 the corolla. 



COLORATION. 



1241. As the colour ranges parallel with the import 

 or quality of the matter, or since the matter and colour 

 are of one and the same kind, so also must this hold good 

 of the colour of the light-flower. 



1242. As the corolla only, and not the calyx, is the 

 proper light-organ, so also will it only obey the light in 

 the coloration. 



1243. The corolla can no longer be coloured green, 

 for it is no longer a leaf. Now that which obtains ano- 

 ther signification, which passes over into another element, 

 must, with the function, lay aside also the old colour. The 

 corolla is besides the perishing, fading leaf; as this 

 begins to turn yellow or red in the autumn, so does the 

 corolla immediately at its origin. It is a born autumnal 

 leaf. 



