MORPHOLOGY. 63 



q. The leaves entering into the formation of the 

 calyx and corolla, must be looked upon as the results 

 of two states of metamorphosis, and confluence of nodii ; 

 they are the peripheral parts of two portions of the up- 

 ward growth immediately following each other, evincing 

 the metamorphosis on the one hand by an evident con- 

 traction of axis, and on the other by a change both in 

 form and colour of the typical leaf. 



r. The calyx is composed of leaves representing, as 

 it were, the state of coleophylla, and bearing a relation- 

 ship to the succeeding more finely organized ones, some- 

 what similar to that borne by the scales of a leaf -bud 

 to their contents. 



5. At a higher state of morphological evolution, 

 the leaf becomes coloured, though in the young bud it 

 is mostly a lightish green ; but in this corollaceous 

 form of it the leaf is not complete in the development 

 of all its portions, the lamina being evolved whilst the 

 petiole remains behind as claw, though often very 

 small : should the leaves be united as a continuous 

 piece, the connected claws form the tube, and the la- 

 minae the limb of the monopetalous corolla. 



t. In the stamens is seen the next stage of meta- 

 morphosis of the leaf into generative organs, the petiole 

 being the type of the filament, whilst the anther re- 

 presents its lamina, within which is seen the evolution 

 of the pollen. 



u. The pistil or carpellary leaf, is the last and 

 crowning point of the morphological series, and here 

 the three progressional states of the leaf are fully deve- 

 loped though metamorphosed. 



v. The coleophyllum forms the ovarium, the petiole 

 the style, and the lamina the stigma. 



w. The carpellary leaf rests immediately upon the 

 axis, and therefore the further extension of it is ar- 

 rested, the axis taking part so far only in the evolu- 

 tion of the germ itself, as can ensue from the axis be- 

 coming connected and blended with the suture of the 



