PTURDED  VETCEH I 
n 
3 
and below the stigma clothed with long upwardly-directed hairs, which 
are longer and closer on the outer than on the inner side, and form 
a brush. The anthers lie close to the brush and pollen falls from them 
on the latter at an early stage, when the stigma is at a lower level than 
the hairs, included in the pouch formed by the flat top of the keel, 
when the latter is depressed projecting from the narrow slit at its 
extremity. The ale serve as levers for insects to depress the keel, 
and they are united in two places with the edge of the keel. In the 
Photo. Matson 
TurtepD VetTCH (Vicia Cracca, L.) 
middle of the upper border there is a deep fold in each ala fitting into 
a corresponding hollow in the keel, which lies in front of the pollen 
cavity. The wing bulges in and forms a depression behind this fold 
which fits into a second cavity in the keel, and the two fit very closely, 
the cells interlocking, in a similar manner to the above structures. 
The return of the wings and keel to their former position after an 
insect visit is ensured by their elasticity, by aid of processes on the 
ala that clasp the staminal column, and others on. the carina that 
serve the same purpose, and by the broad base of the standard, which 
curves laterally to clasp the claws of the ale and the carina, the calyx 
holding the standard in position. The flower is visited again and 
