ECOLOGY OF FLOWERS 361 



magnified view of the hairs from the outer surface of 

 mullein petals, shown in Fig. 25 3. 1 



Sometimes the recurved petals or divisions of the corolla 

 stand in the way of. creeping insects. In other cases the 



FIG. 253. Branching Hairs from the Outside of the Corolla of the Common 

 Mullein. (Magnified.) dr, a gland. 



FIG. 254. A Sphinx Moth, with a Long Sucking-Tube. 



throat of the corolla is much narrowed or closed by hairs, 

 or by appendages. Those flowers which have one or more 



1 On protection of pollen, see Kerner and Oliver, Vol. II, pp. 95-109. 



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