1881. 



on Fruits and Seeds. 



Gil 



also in that of the pappus, it is by no moans always tho samo part of 

 tho plant which dcvolops into the crown of hairs. Thus in the 

 Valerians and Composites it is tho calyx ; in tho Bulrush, tho 

 perianth ; in Epilobium, tho crown of tho seed ; in tho Cotton-Grass 

 it is supposed to represent tho perianth ; while in some, as, for 

 instance, in the Cotton plant, the whole outer surface of tho seed is 



Fig. 13. 



a, willow herb (Epilobium); b, two forms of seed of Thrincia hirta; c, Tamarix ; d, willow 

 {Salix); e, cotton-grass (Kriophoruvi) ; /, bulru:<h (Typha). 



clothed with long hairs. Sometimes, on the contrary, the hairs are 

 very much reduced in number, as, for instance, in some species of 

 ^schynanthus, where there arc only three, one on one side and two on 

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

 wrap round the wool of any animal with which they may come in 

 contact, so that they form a double means of dispersion. 



Vol. IX. (No. 74.) 2 u 



