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Hydrocotyle umbellata Linnaeus. Common name: Marsh Water-pennywort. Phenology: Apr-Oct. Habitat: Moist areas, including maritime grasslands. Distribution: NB; near the Great Lakes in w. NY, ne. OH, s. MI, n. IN, and ne. IL; MA to s. FL, west to sc. TX, south through Mexico to Central America and South America; CA south into Mexico; West Indies. Reported as a likely introduction for s. MO (Aaron 2024).

ID notes: Hydrocotyle umbellata can co-occur in maritime situations with H. bonariensis, which has larger leaves the blade generally held at a right angle to the ground's surface.

Origin/Endemic status: Native

Synonymy ⓘ: = Ar, Bah, C, Can, Chap, F, Fl7, FNA13, G, GW2, Il, K4, MC, Meso4.1, Mex, Mi, NcTx, NE, NY, Ok, Pa, RAB, S, S13, Tat, Tn, Tx, Va, WH3; < Hydrocotyle umbellata L. — NE; Hydrocotyle umbellata L. Basionym: Hydrocotyle umbellata L. 1753

Links to other floras: = Hydrocotyle umbellata - FNA13

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Wetland Indicator Status:

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

Heliophily ⓘ: 6

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image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Alan Cressler: Hydrocotyle umbellata, Lake Wales Ridge, Lake Wales Ridge Wildlife and Environmental Area, Highlands County, Florida 1 by Alan Cressler source | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Floating-creeping, aquatic perennial of marshes, shores of rivers or lakes and other moist areas.

Stems: Stems fleshy, branching, smooth.

Leaves: Leaves alternate, on long petioles attached near the center of the blade, round to kidney-shaped, notched at base, scalloped-edged, shiny and smooth.

Inforescence:

Flowers: Flowers in erect, stalked umbels of 10-35+ arising separately from leaves and sometimes over-topping them; white; 1/8 in. wide; consisting of 5 spreading petals, insignificant sepals and 5 stamens.

Fruits:

Comments:

Height: 3-8 in.

plant sale text:

bloom table text:

description: Floating-creeping, aquatic perennial of marshes, shores of rivers or lakes and other moist areas.

stems: Stems fleshy, branching, smooth.

leaves: Leaves alternate, on long petioles attached near the center of the blade, round to kidney-shaped, notched at base, scalloped-edged, shiny and smooth.

inflorescence:

flowers: Flowers in erect, stalked umbels of 10-35+ arising separately from leaves and sometimes over-topping them; white; 1/8 in. wide; consisting of 5 spreading petals, insignificant sepals and 5 stamens.

fruits:

comments:

cultural notes:

germination code:

native range:



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