308 METAMOBPHY. 



Payer, in his * Organogenie,' p. 38, mentions a 

 stamen of Diomva bearing not only an anther, but 

 likewise an ovule. 



Sempervimim tectonmi and 8. montannm have long 

 been noticed as being very prone to present this change. 

 Mohl^ remarks that, in the transformation of the 

 stamens to the pistil in the common houseleek, the 

 filament of the stamen generally preserves its form, 

 the anthers alone undergoing change. At other times, 

 however, the transformation takes place at the same 

 time, both in the filament and in the anther. When 

 the stamens are numerous some of them remain in 

 their normal state, while others, and especially the 

 inner ones, undergo a change. Sometimes all the 

 stamens are changed simultaneously, while at other 

 times some of these organs may be found in which the 

 anther is partially filled with ovules, and partially with 

 pollen. 



In the accompanying figures (fig. 165, a h) a 

 series of intermediate stages is shown between the 

 ordinary stamen of Sempervivum tectorum and the 

 ordinary carpel, from which it will be seen that the 

 filament is little, if at all, affected, and that in those 

 cases where there is a combination of the attributes 

 of the stamen and of the pistil in the same organ the 

 pollen is formed in the upper or inner surface of the 

 leaf-organ, while the ovules arise from the opposite 

 surface from the free edge, (h, c, d, e,/, g). 



In a drawing made by the Rev. G. E. Smith of a mal- 

 formed flower of Primula acaulis^ and which the writer 

 has had the opportunity of examining, the stamens are 

 represented as detached from the corolla, and their 

 anthers replaced by open carpels, with ovules arising, 

 not only from their edges, but also from their surfaces, 

 while the apex of the carpellary leaf was drawn out 



' Ann. Scienc. Nat.,' t. viii, 1837, p. 50, and ' Bot. Zeit.' (K), 1836, 

 t. xix, p. 513, &c. See also MM. Sourd Dussiples and G. Bergeron, 

 'Bull. Soc. Bot. France,' viii, p. 3^t9; Von Scbmidel, 'Icon, plant, et 

 Anal, part.,' 1782, p. 210, fig. 51. 



