HI.] WILLOW HERB. THRINC1A. 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 ALschynanthus, where 



FIG 48. 



a, willow herb {Epilobiuiii) ; b, two forms of seed of Thrincia hirta : c, Tdmarix , 

 d, willow (Salix) ; e, cotton grass (Eriopkortttti) ; f, bulrush {Typha). 



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

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



