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Podostemum ceratophyllum Michaux. Common name: Threadfoot, Riverweed, Riffleweed. Phenology: May-Jul. Habitat: Attached to rocks and dams in rapidly or slowly flowing water. Distribution: NS, ME, and QC south to sw. GA, s. AL, s. MS, se. LA (Florida parishes), AR, and w. TN; disjunct in the Ozark-Ouachita Highlands of w. AR and e. OK; Dominican Republic; Honduras.

Origin/Endemic status: Native

Taxonomy Comments: Fehrmann, Philbrick, & Halliburton (2012) demonstrated very low genetic diversity in the populations of Podostemum ceratophyllum north of the glacial maximum, in the Ozark-Ouachita Highlands, and in Central America, and high genetic diversity in the portion of the unglaciated southeast east of the Mississippi River.

Synonymy ⓘ: = Ar, C, Can, F, FNA6, G, K4, NE, NS, NY, Pa, POWO, RAB, Tn, Va, W, WV, Graham & Wood (1975), Philbrick & Crow (1983); = Podostemon ceratophyllum Michx. — GW2, Tx, orthographic variant; > Podostemon abrotanoides Nutt. — S, S13; > Podostemon ceratophyllum Michx. — S, S13, orthographic variant. Basionym: Podostemum ceratophyllum Michx. 1803

Links to other floras: = Podostemum ceratophyllum - FNA6

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL
  • Eastern Mountains and Piedmont: OBL
  • Midwest: OBL
  • Northcentral & Northeast: OBL

Heliophily ⓘ: 8

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image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Alan Cressler: Podostemum ceratophyllum, Congaree River, Richland County, South Carolina 1 by Alan Cressler source | Original Image ⭷
image of plant© Alan Weakley source | Original Image ⭷

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Horticultural Information

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