Ageratum (Asteroideae- Eupatorieae)
Keys as per Flora of North America: 3 (2) Peduncles minutely puberulent and sparsely to densely pilose, eglandular; phyllaries oblong-lanceolate, abruptly tapering to subulate tips 0.5–1 mm, glabrous or sparsely pilose, margins often ciliate, abaxial faces eglandular 3 Ageratum conyzoides + Peduncles mixed pilose, stipitate-glandular, and viscid-puberulent; phyllaries narrowly…