Fig. 405: Polygonum argyrocoleon: a, habit, upper part of plant, x %; b, habit, 

 lower part of plant, x -/:,; c, leaf and sheath, x 3; d, mature achene, partially enveloped 

 by perianth, x 8; e, perianth, spread out, showing reduced glands between stamens, 

 X 8; f, pistil, x 8; g, achene, x 6; h, achenes (cross section), x 6; i, tip of inflorescence, 

 X 4. (From Mason, Fig. 196). 



