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Myriophyllum laxum Shuttleworth ex Chapman. Subgenus: Brachytheca. Section: Tessaronia. Subsection: Spondylastrum. Loose Water-milfoil. Phen: Jun-Oct. Hab: Limesink depression ponds (dolines), spring-runs, rarely also in lakes. Dist: Se. VA south to n. FL, s. AL, s. MS (Sorrie & Leonard 1999), and e. LA (Reid et al. 2021). Documented for VA by a 1922 specimen from Princess Anne County at GH (Sorrie, pers. comm.).

ID notes:M. laxum and M. heterophyllum both have reddish submersed stems and present difficulties in identification when in sterile condition. M. laxum has a total of 7-15 (-17) segments per leaf, vs. (15-) 17-31 (-37) segments in M. heterophyllum.

Origin/Endemic status: Endemic

Synonymy: = Fl2, FNA10, GW2, K1, K3, K4, RAB, S, S13, Va, WH3, Aiken (1981), Moody & Les (2010); = Myriophyllum ×laxum Shuttlew. ex Chapm. (pro sp.) – NE; = n/a – C

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL

Heliophily: 9

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image of plant© Alan Cressler: myriophyllum laxum, taylor county, georgia 3 by Alan Cressler source | Original Image ⭷
image of plant© Alan Cressler: myriophyllum laxum, taylor county, georgia 2 by Alan Cressler source | Original Image ⭷
image of plant© Alan Cressler: myriophyllum laxum, taylor county, georgia 4 by Alan Cressler source | Original Image ⭷

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