Helianthus debilis Nutt.
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad A-Forb

Helianthus debilis R. W. Smith

Collected as a waif at River Rouge, Detroit (Wayne Co.), by O. A. Farwell in 1912 and along a railroad near East Lansing (Ingham Co.) by E. E. Watson in 1923 (MSC). This rare escape from cultivation is subsp. cucumerifolius (Torr. & A. Gray) Heiser, native much farther south.

The leaves are quite distinctive, with blades less than 8 (–9) cm long, and plants never attain the robust size of which H. annuus is capable.


Ingham County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 22, 2021. https://michiganflora.net/species.aspx?id=346.