260 



SPOTTED KNOTWEED. 



FIG. LIV. Polygonum Persicaria : 2, portion of a cluster enlarged ; 3, a flowery 

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



The Stipules are of a pattern called ochrece. 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. 



