Fig. 51: Najas guadalupensis: a, young and mature pistillate flowers, borne singly 

 in leaf-sheath axils, X 8; b, mature seed, dull but distinctly reticulate, X 16; c, habit, 

 showing plant with threadlike crowded leaves, X %; d, habit, showing plant with less 

 crowded leaves, X 1%; e and f, leaf blade, showing marginal and apical teeth, X 6V2', 

 g and h, young staminate flowers borne singly in leaf-sheath axils, the anthers still 

 enveloped by the spathe, X 8; i, anther (cross section), X 12; j, mature anther at 

 anthesis, showing ruptured spathe, X 8. (From Mason, Fig. 36). 



