Fig. 411: Polygonum densiftorum: a, habit, x 3; b, ocrea, x %; c, part of flower- 

 ing spike, X 3; d, perianth enclosing mature fruit, x 10; e, achene, x 10; f, cross section 

 of achene, x 10. (Courtesy of R. K. Godfrey). 



