Myriophyllum aquaticum (Vell.) Verdc.
Common Name: PARROT-FEATHER WATER-MILFOIL
Coefficient of Conservatism: *
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Ad P-Forb

Myriophyllum aquaticum habit G. E. Crow habit

A South American species commonly grown in aquaria and ponds, and rarely (thus far) escaping in ponds in developed settings. It is apparently able to survive winters under water, and has become established north to southern New England. First collected in Michigan in 1962, by Eldon Whiteman at the edge of a creek in Kalamazoo Co., but the record overlooked; more recently found in 2013 in Wayne Co. by D. Rayner, S. Shaw and S. Tangora. A major pest in the southern US, it should be watched to see how aggressive it will be in Michigan.

This is a striking species, quite different from all our other Myriophyllum. The flowers are born above surface of the water, like most of our species, but in the axils of fully developed dissected leaves (looking much like the submerged leaves) rather than subtended by bracts that are quite different from the submersed leaves. The species is apparently dioecious; our collection is female.

Locations

Kalamazoo County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 12, 2017. http://www.michiganflora.net/species.aspx?id=2907.