Vascular Plants of North Carolina
Account for Loose Water-milfoil - Myriophyllum laxum   Shuttleworth ex Chapman
Members of Haloragaceae:
Members of Myriophyllum with account distribution info or public map:
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Section 6 » Order Haloragales » Family Haloragaceae
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AuthorShuttleworth ex Chapman
DistributionSandhills and southern outer Coastal Plain. The gap appears to be real and not a collecting artifact.

Coastal Plain, southeastern VA to northern FL and southern MS. As it occurs rarely in southeastern VA, it could be found eventually in the northern half of the NC Coastal Plain.
AbundanceRare to uncommon. The NCNHP database lists 17 records, of which 6 are in good to excellent condition, but with almost half seemingly historical. It is a State Endangered species, probably because it is globally quite rare (G3).
HabitatNatural depression ponds, sinkhole ponds, blackwater impoundments.
See also Habitat Account for Coastal Plain Herbaceous Ponds and Sloughs
PhenologyFlowering and fruiting June-September.
IdentificationLoose Water-milfoil grows very much like M. heterophyllum and also has reddish stems and greenish brown leaves. However, it has only 7-15 (-17) leaf segments vs. 15-31 (-37), and its flowering bracts are tiny and barely longer than flowers and fruits vs. broad and much longer in that more common species.
Taxonomic CommentsNone

Other Common Name(s)Lax Water-milfoil
State RankS2
Global RankG3
State StatusE
US Status
USACE-agcpOBL link
USACE-empOBL link
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B.A. SorrieCumberland County, 2019, Bonnie Doone Lake. CumberlandPhoto_natural
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