58 



inwards, thus concealing the nectar effectually, and barring 



out short tongued insects. Robertson says: "The nectar 



is leached by a bee 



thrusting its ptoboscis 



between the separating 



ends of the filaments," 



The flowers are protero- 



gynous; self-pollination 



is prevented because the 



stigmas are much longer 



than the stamens. 



Strawberry. The 

 flowers of the strawber- 

 ry are conspicuous be- 

 cause collected m patch- 

 es. Nectar is secreted 



Fig. 



FIG. 23. 

 Flower of Strawberry. 



by the receptacle at the 

 base of the filaments,- next 

 to the outer row of pistils 

 where it is held. The 

 flowers are gynodioecious, 

 the fe^male flowers are 

 smaller and bear shorter 

 stamens. The starainate 

 in some cultivated varie- 

 ties, as the Bubach are 

 very large. The plant 

 may be self-pollinated, al- 

 though nearly always 

 cross-pollinated. It is vis- 

 ited by honey bees frequently at Ames and also by species 

 of Halictus- 



Fig-. 21. 



FIG. 24. 

 Flower of Strawberry. 



