816 ON NAIAS GRAMINEA DEL., VAR. DELILEI MAGNUS. 
occur only on those shoots where the internodes are suppressed. 
This was not the structure in_the Lancashire 
WAF = found side by side (see figs. 67 and 68) in the 
of 
also found in all stages of development, quite young 
ones lying side-by-side with those more developed. 
te e great majority of the plants produced fully- 
Fig. 67. developed flowers, both male and female, the latter 
: eing much the more numerous. The species 18 
monecious ; even in those instances in which I found only female 
flowers on the individual plant, I could not be sure that male 
flowers had not been produced, or would not have been produced later _ 
on. It was not usual, though by no means infrequent, to find both 
