Fig. 36: Polamogeton pusillus: a, flowering spike, X 6; b, achene, obliquely obovoid, 

 smooth, with slightly recurved beak, X 8; c, achene (longitudinal section), X 8; d, habit, 

 showing narrowly linear submersed leaves, X %; e, stem (cross section), X 20; f, part 

 of stem, showing young tubular stipules in upper part and split disintegrating stipules 

 at base, X 2; g and h, winter buds, X I'/j. (From Mason, Fig. 24). 



