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Thaspium

1. Basal leaves at least twice-compound; margins of leaflets minutely ciliate, with ca. 3โ€“5 (โ€“7) coarse and irregular teeth or lobes on a side.

T. chapmanii

1. Basal leaves simple or trifoliolate; margins of leaflets smooth and glabrous, the principal ones with ca. 10โ€“40 fine and regular teeth on a side.

T. trifoliatum

All species found in Thaspium

Thaspium chapmaniiMEADOW-PARSNIP 
Thaspium trifoliatumMEADOW-PARSNIP 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 22, 2017. http://michiganflora.net/genus.aspx?id=Thaspium.