1)8 VEGETABLE ORGANOGRAPHY. 



this case ; that of multiplication represents better the 

 preceding, where all the supernumerary organs result 

 from all the parts of a single organ. It is true that they 

 are generally of smaller size, but it is likely that this is 

 referable to the general law of vegetation, — that where a 

 large number of organs is produced within a given space, 

 they find there less nourishment, and take a less degree 

 of development. 



§ 3. — General Examination of Double Flowers. 



It is customary to designate under the name of 

 Double Flowers (Jtores pleni) all those where all the 

 different floral organs, or one or two of them, take the 

 appearance of petals, and those where the number of 

 petals is, or appears to be, increased by any cause. 



Double flowers ought, in my opinion, to be classed in 

 three divisions : — 



1st. Petalodeous Flowers (fiores petalodei), that 

 is to say, those which become double by the simple de- 

 velopment into petals of all or any of the floral organs : 

 such are those where this development affects the bracts 

 (Hortensia), the calyx (Primula calycanthema), the 

 stamens (Rosa, See), or the carpels (var. of Anemone 

 nemorosa, &c.) We may also distinguish two cases 

 among petalodeous flowers which proceed from the de- 

 velopment of the stamens — viz. that where it takes place 

 by the dilating of the filament and the entire abortion of 

 the anther; and that where the filament remains in its 

 natural state, and the cells of the anther are developed 

 into petals. In the first case, which is by far the more 

 frequent, the supernumerary petals are always flat; in 

 the second they are horn-shaped. The Ranunculaeea? 

 present this double mode of transformation in a singular 



