Fig. 409: Polygonum ampliibiunv. a, stem of terrestrial plant, the mature branch 

 glabrous, the young branch puberulent, x %; b, part of flowering spike, showing the 

 short-pediceled fasciculate flowers in axils of hairy sheathing bracts, x 4; c, habit, ter- 

 restrial plant, pubescent, x %; d, mature achene, x 6; e, stipular leaf sheaths, terrestrial 

 plant, X %; f, lower part of stem, aquatic form, showing roots at the swollen nodes, 

 X %; g, habit aquatic plant, glabrous, x %; h, flower, spread open to show the con- 

 spicuous glandular disk and regular stamen insertion, x 4. (From Mason, Fig. 198). 



