26 NYMPHAEACEAE [CH. 



roots may be seen in Fig. 1 1 A^ and their rudiments (r.) in Fig. 

 1 1 B and D. In Nymphaea lutea stipules are absent but the 



FIG. ii. Castalia alba, Greene. Apical part of rhizome pulled up from bottom of 

 water, June 30, 1913. In A, the leaves and flowers have mostly been cut away to 

 show the young flower buds, the young leaves and the stipules which protect them. 

 In B, C, D, three views are given of a young leaf and its stipule (or pair of stipules 

 united on the adaxial side) st. In B and D the rudiments of the roots, r., are seen 

 at the leaf-base. (\ nat. size.) [A. A.] 



petioles are winged, and the stipules seem to be replaced by a 

 silky fringe of hairs 1 . 



1 Irmisch, T. (1853). 



