Thaspium Nuttall. Meadow-parsnip.
A genus of 3-6 species, perennial herbs, temperate, of e. North America (Plunkett et al. 2018a). Thaspium and Zizia are closely related (sister to one another) and their traditional separation as genera should be re-evaluated.
ID notes:Because Thaspium and Zizia are often confused when not in fruit, a combined key emphasizing vegetative characters has been provided; it may also be helpful to use the key to genera, and if a clear answer is obtained, then use the Thaspium-Zizia combined key, skipping taxa of the "wrong" genus.
Ref: Cooperrider (1985); Coulter & Rose (1900); Floden (2019); Mathias & Constance (1945); Plunkett et al. (2018a) In Kadereit & Bittrich (2018). Show full citations.
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© Bruce A. Sorrie | 
© Alan M. Cressler | 
© Richard & Teresa Ware | Thaspium pinnatifidum CC-BY-NC, permission granted to NCBG | Original Image ⭷
© Richard & Teresa Ware