v.] LINARIA, ANTIRRHINUM. 145 



present, and in some cases bears pollen. Scr. nodosa 

 is proterogynous, and is much frequented and fertil- 

 ised by wasps. Pentstemon also has a fifth stamen, 

 which curves in a very curious manner from the 

 upper to the under side of the flower so as to be 

 out of the way of the pistil. Ogle regards it as 

 perfectly useless (Popular Science Review, Jan. 1870), 

 but it is so large that I cannot help thinking it must 



FIG. too. FIG. 101. FIG. 102. 



FIG. 100. Section of Digitalis furpurea, showing the anthers unripe and horizontal. 

 FIG. 101. Ditto, more advanced. The upper anthers ripe and vertical, the lower ones 



as before. 

 FIG. 102. Ditto, still more advanced. All the anthers ripe and vertical 



have some function, though I am unable to suggest 

 one. 



In Linaria vulgaris the flowers form a closed box 

 terminating behind in a spur, 10 13 mm. in length, 

 which contains the honey, and the orifice of which is 

 protected by hairs. Under these circumstances, the 

 long-lipped bees are the only insects which can suck 

 the honey. Antirrhinum majus (the Snapdragon) 

 differs in the larger size of the flowers, the greater 



L 



