92 
Sudden Appearance and Constancy. 
wheat ear carnation (Dianthns Ca- 
ryophyllns spicatus). 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 appear 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. 1 
The green rose has been known 
from time immemorial, but the green 
Pelargonium Donalds a modern 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 
cuttings. 
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. 2 Ra- 
1 After having been sown these seeds 
have repeated the wheat-ear variety (Note 
of 1909). 
2 K. GOEBEL, Beit rage zur Kcnntniss gc- 
Fig. 14. Elongated Green fi'illtcr Blilthen, Jahrb. f. iciss. Bot., Vol. 
Dahlia, a new variety. XVII, pp. 217-219, and elsewhere. 
