HBETEROTAXY. 18] 
flower-bud for an ovule or from prolification ; there are 
certain cases, however, where the new growth seems 
not to be either due to metamorphosis or to prolifi- 
cation strictly. 
The cut, fig. 94, represents a case where, in the 
dilated upper portion of the ovary of Sinapis arvensis, 

Fiq. 94.—Distended pod of Sinapis arvensis bearing in the interior 
stalked fiower buds. 
two flower-buds were found projecting from a raised 
central line, cérresponding, as it. would seem, to the 
midrib, and not to the margins of the carpel. Similar 
cases have occurred in Nasturtiwm amphibium, Brassica 
Rapa, and Passiflora quadrangularis. 
In Bromfield’s ‘ Flora Vectensis,’ p. 35, the following 
account is given of an abnormal development in Carda- 
mine pratensis: ‘*On the lower part of the corymb 
were several seed vessels on pedicels changed from 
their usual linear to an ovate elliptical figure, so as to 
resemble a silicula. These, on bemg opened, were 
found to contain petals of the usual colour, which in 
the pods above had burst from their confinement and 
appeared as semi-double fiowers ; the valves of the pod 
answering to the true calyx. * * * From their verti- 
cillate arrangement it is evident that these petaloid 
expansions were not transformed seeds, but simply a 
development of the common axis within the ovary into 
an abortive whorl of floral organs, besides which there 
were evident rudiments both of stamens and germens 
