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Haloragaceae
Myriophyllum

not marked as a favorite taxon Myriophyllum laxum Shuttleworth ex Chapman. Common name: Loose Water-milfoil. Phenology: Jun-Oct. Habitat: Limesink depression ponds (dolines), spring-runs, rarely also in lakes. Distribution: 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.).

Glossary (beta!)

Subgenus: Brachytheca. Section: Tessaronia. Subsection: Spondylastrum.

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, K4, RAB, S, S13, Va, WH3, Aiken (1981), Moody & Les (2010); = Myriophyllum ×laxum Shuttlew. ex Chapm. (pro sp.) — NE; = n/a — C. Basionym: Myriophyllum laxum Shuttlew. ex Chapm. 1883

Links to other floras: = Myriophyllum laxum - FNA10

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL

Heliophily ⓘ: 9

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image #1 of Myriophyllum laxum© Alan Cressler: myriophyllum laxum, taylor county, georgia 3 by Alan Cressler source | Original Image ⭷
image #2 of Myriophyllum laxum© Alan Cressler: myriophyllum laxum, taylor county, georgia 2 by Alan Cressler source | Original Image ⭷
image #3 of Myriophyllum laxum© Alan Cressler: myriophyllum laxum, taylor county, georgia 4 by Alan Cressler source | Original Image ⭷

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Horticultural Information

NCBG trait

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