|Robin's Plantain (Erigeron pulchellus)|
I am sure so far that I've identified a variety of smartweed based on leaf shape and hairlessness and the presence of ocreae (membranous sheathes where branches emerge). Initially, I thought it was Polygonum persicaria, or Lady's Thumb, based on the characteristic blotch on the leaf (presumably, the thumbprint of a lady with sooty hands).
However, the ocreae in Lady's Thumb are fringed with hairs and my specimen is decidedly unhairy all over. Despite the presence of the blotch, it is likely that my specimen is the very similar Pennsylvania Smartweed (Polygonum pensylvanicum) or Green Smartweed (Polygonum scabrum). An ocrea is a membranous sheath that surrounds the point where a stem branches off.
|Unhairy ocrea rules out Lady's Thumb|
|Back to its roots|