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1. Heads with conspicuous rays clearly exceeding the involucre.

S. vernalis

1. Heads with rays minute or none.

2. Leaves and stems densely glandular pubescent; bracteoles at base of involucre (2โ€“) 2.5โ€“5.5 mm long.

S. viscosus

2. Leaves and stems glabrate to densely pubescent, but glandular hairs absent or sparse; bracteoles at base of involucre 0.9โ€“2.6 mm long.

3. Bracteoles at base of involucre and involural bracts with greenish tips (unicolorous); rays present but minute; plant densely pubescent, with glandular hairs sometimes present but sparse.

S. sylvaticus

3. Bracteoles and involucral bracts greenish with conspicuous blackish tips; rays none; plant without glandular-viscid hairs (glabrate to somewhat tomentose).

S. vulgaris

All species found in Senecio

Senecio sylvaticusWOODLAND RAGWORT 
Senecio vernalisEASTERN GROUNDSEL 
Senecio viscosusSTICKY RAGWORT 
Senecio vulgarisCOMMON GROUNDSEL 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 13, 2017. http://michiganflora.net/genus.aspx?id=Senecio.