200 



gK)TTED KNOTWEED. 



Fig. LIV.— Polj^onum Persicaria : 2, portion of a cluster enlarged ; 3, a flower 

 4, ovary and 2 styles ; 5, achenium ; 6, seed dissected, showing the embryo. 



The SHjndes are of a pattern called ochrecB. They grow 

 in pairs from the base of the petiole as usual, but unite into 

 a membranous sheath clasping the node and stem like a boot 

 (ochrea), and in this species are fringed, or ciliate with a few 

 long hairs. The outline, margin, construction and quality 

 of the leaf, including the heart-shaped spot in the center, 

 should all be noted. 



