AUTOGAMY BY ELONGATION OF PISTIL. 349 



that may happen to be brought by insects to be transferred to the stigma, owing to 

 the anthers forminga hood over it. At this stage every other ol subordinated 



to the dispersion, through the agency of insects, of the pollen exposed by the flov 

 After the interval of another day the observer finds a third aspect of the flower pre- 

 sented to him. The filaments have straightened themselves out, and so brought the 

 anthers nearer to the stigma; the coating of pollen has spread all over the anthers, 



Fig. 298. Autogamy brought about by elongation of the pistil. 



i. , 3 Flower of Epimedium alpinum at successive stages of development, showing 



and the ovary has undergone elongation, carrying the stigma into the midst of the 

 dome of anthers, where it becomes thickly overlaid with pollen 



Again in the nodding flowers of Atragene alpina, and in thes< 

 integrifolm, which grows freely in the swampy meadows of the Hungarian plains, 

 we find autogamy effected by means of an advance of the pistil into proxumty to 

 the anthers laden with pollen. Both plants are protogynous-the sbgma. 

 mature for a short time before the anthers dehisce-and in both the newly-opened 



