EXPLANATION OF PLATE 9. 

 TuLE {Scirjnis lacustris). 



Fig. a, rootstock, roots, sheathing base of the stem, summit of the stem, and 

 inflorescence. Figs, b and c, flowers, from within, showing the scale behind. In c 

 the stigmas are mature, but the stamens not yet fully developed; in h the stigmas 

 have withered, the ovary enlarged, and the stamens matured. Fig. d, a scale, 

 viewed from the back. Fig. e, a mature nutlet with its barbed bristles. Fig. /, a 

 cross section of the nutlet. Fig. a is half natural size, figs, b and c five times 

 enlarged, and figs, d to /ten times enlarged. 



