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Wetland and Aquatic Plants
of
Oklahoma
Interactive Keys: Submersed
Water-milfoil
(Haloragaceae)
1.
Leaves in whorls (Myriophyllum)
Parrot
feather (Myriophyllum aquaticum
(Vell.) Verdc.)
Introduced perennial
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thumbnails to enlarge
A perennial
species native to the Amazon River
basin. The first North American
specimen was collected in Washington, D.C., in 1890.
The plant is listed as a noxious weed in several
state. The plant is sold in both the
aquarium and
water gardening trade. Consumers should
take great care and avoid purchasing this plant, which is sold under
numerous
common names. Interestingly, almost all
plants in North America are female, so reproduction is primarily by
fragmentation of stems. In some states,
boats are inspected when removed from a water body to insure that no
Parrot
feather stems are attached.
Two-leaf
watermilfoil (Myriophyllum
heterophyllum Michx.)
Native perennial.
Two-leaf
watermilfoil exhibits a classic trait of aquatic
plants; leaf heterophylly. In other
words, there are two leaf types on each plant, submerged and aerial. The submerged leaves tend to be deeply
dissected and the aerial leaves much less so.
Green
parrot’s feather (Myriophyllum
pinnatum (Walt.) B.S.P.)
Native perennial.
Last update: 1/27/04
Comments to : Bruce Hoagland
bhoagland@ou.edu
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