Proserpinaca pectinata Lam.
Coefficient of Conservatism: 9
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb
Status: E
Proserpinaca pectinata fruit G. E. Crow fruit

A species of the Coastal Plain, from Texas to Nova Scotia; apparently the only locality in the Great Lakes region is along a sandy ditch in Ottawa Co., where a copious collection of fruiting material was made in 1941 (C. W. Bazuin 4180, MICH, ALM). The site was rediscovered in 1984 (A. A. Reznicek et al. 7432, MICH, MSC): an old peaty excavation, where P. palustris also occurs. Intermediate plants, in fruit, were found where the two species grow together. These apparent hybrids may presumably be called P. ×intermedia Mack. Catling (1998) recognized P. intermedia as a species in the southeastern United States, though admitting it is “probably of hybrid origin.”

The 3-angled fruit in the axils of stiff emersed alternate pectinate leaves will distinguish this species from any Myriophyllum.


Ottawa County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 29, 2022.