Fig. 768: Bidens cerniia: a and b, disk flowers, showing stages of anthesis of 

 stamens and style, x 3; c, ray flower and base of adjacent phyllary, x 3; d, inner 

 phyllary, x 4; e and f, receptacle bracts, x 4; g, mature achene, showing the callous- 

 thickened margins, the 4 pappus awns, and retrorse pubescence, x 4; h, base of plant, 

 showing the fascicled roots, x %; i, upper part of plant, showing leaves and inflores- 

 cence, x %; j, leaf, x %. (From Mason, Fig. 350). 



