v.] 



LINARIA, ANTIRRHINUM. 



137 



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. 



Fic. 101. 



Fig. I07. 



Fig. 100. — Section of Digitalis purintrea, showing tlle 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 



