46 HYDROCHARITACEAE [CH. 



Solereder 1 to an anatomical peculiarity of the laminae, the 

 occurrence, namely, of small inversely orientated bundles in the 

 mesophyll (Fig. 28) 2 . 



Hydrocharis is generally described as dioecious, but further 

 observations are needed on this point. A botanist who examined 

 the species in Sweden records that, if the male and female 

 ' plants ' are removed from the water without breaking the 

 intermediate stolons, they are found in reality to be shoots 



xy- 



P x , 

 camL 



FIG. 28. Hydrocharis Morsus-ranae, L. Midrib (m.) and adjacent inverted bundle 



(i.b.) from transverse section of leaf. xy. = xylem ',ph. = phloem ; l.b. = lateral branch 



of midrib ; px. = protoxylem. ( x 198 circa.) [A. A.] 



belonging to the same complicated vegetative system, and not 

 separate individuals 3 . 



Though the flowers of the Frogbit are not uncommon, seed 

 is hardly ever set in this country. The ripened seed vessels are to 



1 Solereder, H. (1913). 



2 Cf. Stratiotes^ p. 52. See also pp. 337-345. 

 3 Lindberg,S. O. (1873). 



