Wednesday, October 28, 2015

Common Knotweed




Another common annual - this is Common Knotweed, Polygonum aviculare. It is in the family Polygonaceae which contains all the docks and buckwheat. The Latin derives from 'many knees' as the nodes of many species are swollen, looking like knees. The papery stipules form a sheath known as an ochrea
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