Fig. 404: a-e, Polygonum sagittatum: a, upper part of plant, x i/^; b, section of 

 stem, X 3; c, flower cluster, x 5; d, flower spread out, x 5; e, mature capsule, x 5. f-h, 

 Polygonum aviculare: i, habit, x %; g, section of flowering branch, x 5; h, mature 

 capsule, X 5. (V. F.). 



