AUTOGAMY BY MOVEMENTS OF STAMENS. 



343 



namely, pseudo- hermaphrodite (c/. p. 294) male flowers (fig. 296 ') and true lu-r- 

 maphrodite flowers (figs. 296 2 ' 3 - 4 ). The latter open earlier than the form, r, 

 which, indeed, never come into play until the hermaphrodite flowers have cast 

 both stamens and petals. Directly the petals open in the hermaphrodite flowers 

 a finely-granulated honey-secreting disc and two short styles are revealed in the 

 middle of the flower. The stigmas at the extremities of the styles are already 

 mature, but the stamens are incurved like hooks and have their anthers still closed 

 (fig. 296 2 ). The day after, also, when the petals have opened further back and 



Fig 297 -Autogamy effected by inclination of curved stamen*. 

 Agrimonta Eupatoria. *. , " natural size ; the rest of the figures magnified. 



the filaments have straightened out (fig. 296 ), the anthers surrounding the stigma 

 in a circle are still closed, so that pollination can only take place at 

 the event of insects bringing pollen from other flowers. The anthers and 1 

 have, however, now entered upon an active phase. The curved stamen, 

 successively at short intervals, one after the other (after one has started, 

 r olow fs the stamen next but one to the left, and so on till all have done) 

 wards the centre of the flower, bringing their anthers, ^^% 

 undergone dehiscence and are covered with pollen, mto contact w,th t 

 precisely in the manner shown in fig. 296'. Each stamen only stays a short I 



