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- Myriophyllum aquaticum
Family: Haloragaceae
TPIUC
Description
Stems are moderately elongate, relatively stout, partially submersed but with a considerable portion of the leafy branches erect. Leaves are pinnately dissected, all whorled, stiffish, usually with 20 or more linear-filiform divisions, the upper divisions 4-8 mm long, the lower divisions much reduced, appearing featherlike, grayish green. Emersed leaves are usually 2.4-5 cm long, the divisions to 8 mm long, petiole 5-7 mm long. Flowers in North America are all female, white, in the axils of essentially unreduced leaves.
Interesting
facts
This species grows rooted in the substrate with part of the plant beneath the surface of the water and a portion of the nonflowering stem emersed. Plants do not form turions. This species forms creeping rhizomes that may give rise to multiple stems. Stems branch and root at the nodes allowing for formation of fragments.
Plants grow in sluggish waters, edges of streams, lakes, ponds, drainage and irrigation ditches, and canals, backwaters, sloughs and lagoons. Populations may be quite dense, sometimes as floating mats that have been uprooted, often choking waterways and impeding navigation.
VIDEO
Links to more information
Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers
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