Fig. 414: Polygonum Persicaria: a, mature achene, lenticular, x 6; b, mature achene, 

 trigonous type, x 6; c, perianth, spread open, showing stamens inserted irregularly, x 

 8; d, tip of spike, showing flowers and ciliate sheathing bracts, x 4; e, stipular leaf 

 sheaths, strigose, apices bristly-ciliate, x l^i;; f, habit, basal part of plant, showing some 

 roots at nodes, x %; g, habit, showing the flat, lanceolate leaves and the inflorescence 

 of stout densely flowered spikes, x -/^. (From Mason, Fig. 203). 



