26 (25) Flower and fruit spike of isolated 

 whorls of sessile flowers and fruits 

 raised above the stipules; fruit with 



a short beak Potamogeton pectinatus, 



Sago Pond Weed (other species may 

 occur) 



Figure 27. — (a) Habit sketch; 



(b) stem and flowers X2. 



26 (25) Flower spikes enclosed at 

 first in sheathing leaf 

 base; fruit an assymetri- 

 cal cone-shaped drupe on 

 a long pedicel, 4 to 6 in a 

 cluster, peduncles fre- 

 quently twisted in a spiral 

 coil, pulling the fruits be- 

 low the water surface. . . 



Ruppia maritima, 



Widgeon Grass 



Figure 28.— (a) Habit sketch; 



(b) peduncle, pedicels 

 and fruits XI- 



14 



