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together. . . Bees, as the most skilful and diligent visitors, have 



played the chief part in the evolution of flowers ; we owe to them the most 

 numerous, the most varied, and most specialised forms. Flowers adapted 

 to bees probahh' surpass all others together in variety of colour. The most 

 specialised, and especially the gregarious, bees have produced great differentia- 

 tions in colour, which enable them on their journeys to keep to a single 

 species of flower. While those flowers which are fitted for a miscellaneous 

 lot of short-lipped insects usually exhibit similar colours (especially white 

 01 yellow) over a range of several allied species, the most closely allied species 

 growing in the same locality, when adapted for bees, are usually of different 

 colours, and can thereby be recognised at a glance (e.g., TrifoUum. Lamium, 

 Tenerium, Pedicularis). 



