III.] WILLOW HERB. THRINCIA. BULRUSH. 71 



clothed with long hairs. Sometimes, on the contrary, 

 the hairs are very much reduced in number, as, for 

 instance, in some species of j^schynanthus, where 



Fig. 48. 

 a willow herb (Epilobiiim) ; b, two forms of seed of Thrincia hirta : c, Tamartx ■ 

 ' d, willow (Salix) ; e, cotton grass {Eriophorum) ; /, bulrush (Typhd). 



there are only three, one on one side and two on the 

 other. In this case, moreover, the hairs are vety 



