Fig. 767: Bidens laevis: a, habit, upper part of plant, x %; b and c, disk flowers, 

 showing stages in anthesis of style and stamens, x 2!4; d, ray flower and base of 

 adjacent phyllary, x 2V2; e, mature achene, showing pappus awns and retrorse pubes- 

 cence, X 4; f, flowering head, showing the outer and the inner phyllaries (rays re- 

 moved), X %■ (From Mason, Fig. 351). 



