92 



.f^' 



fy 



•i 1, 



Sudden .Ippcaraiicc and Constancy. 



wheat ear carnation {^Dianthus Ca- 

 ryopliylhis spicafus). In this case 

 we find instead of the flowers small 

 green ears which are formed of green 

 bracts arranged crosswise. This 

 sterile form does not api)ear to be 

 in general cultivation, although it is 

 perennial ; nevertheless it turns up 

 here and there in crops of seedlings 

 especially of mixed varieties. I cul- 

 tivated a plant arisen in this way ; 

 most of the ears were sterile as 

 usual, but some of them produced a 

 flower at their top. From these I 

 obtained several germinative seeds. ^ 

 The green rose has been known 

 from time immemorial, but the i^reen 

 Pelargonium ::onaIc\s a.mo(\Qrn prod- 

 uct. In both cases the petals and 

 stamens are transformed into green 

 leaves. They are said to be perfectly 

 sterile, and are only propagated by 



cuttmgs. 



Many double flowers never pro- 

 duce seed, and this is especially true 

 of those forms which do not develop 

 structures intermediate between sta- 

 mens and petals, but are described 

 as instances of Petalomania.- Ra- 



* After having been sown these seeds 

 have repeated the wheat-ear variety (Note 

 of 1909). 



^ K. GoEREL, Bcitragc cur Kenntniss gc- 

 Fig. 14. Elongated Green fiiUtcr Bliithcn, JaJirb. f. wiss. Bot., Vol. 

 DahHa, a new variety. XVII, pp. 217-219, and elsewhere. 



