Parietaria

1. Leaves densely soft-pilose, the blades less than twice as long as broad; achenes black; bracts about equaling or shorter than the flowers; anthers ca. 1 mm long.

P. judaica

1. Leaves glabrous to only sparsely and minutely pilose, the blades mostly at least (2.5–) 4–6 times as long as broad; achenes pale whitish to brown; bracts much exceeding the flowers; anthers less than 0.5 mm long.

P. pensylvanica

All species found in Parietaria

Parietaria judaicaPELLITORY 
Parietaria pensylvanicaPELLITORY 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 25, 2017. http://michiganflora.net/genus.aspx?id=Parietaria.