Copy permalink to share

Iva annua Linnaeus. Common name: Sumpweed, Rough Marsh-elder. Phenology: Aug-Nov. Habitat: Fields, especially bottomlands, disturbed places; in the eastern and inland part of area probably introduced (by native Americans) from farther west. Distribution: PA, ND, and CO south to FL, NM, and Mexico (the original distribution uncertain). Reported for MD (Longbottom, Naczi, & Knapp 2016).

Origin/Endemic status: Native

Taxonomy Comments: The so-called var. macrocarpa (Blake) R.C. Jackson, known only from archeological remains and presumed extinct, is almost certainly a cultivated form, selected for its large seeds.

Other Comments: This species was an important crop of native Americans.

Synonymy ⓘ: = C, Fl7, FNA21, GrPl, GW2, Il, K4, Mi, NcTx, NE, Oh3, Pa, RAB, SE1, Tn, Tx, Va, W, WH3; = Iva ciliata Willd. — F; = n/a — Tat; > Iva annua L. var. annua — Jackson (1960); > Iva annua L. var. caudata (Small) R.C.Jacks. — Jackson (1960); > Iva annua L. var. macrocarpa (Blake) R.C.Jacks. — Jackson (1960); > Iva caudata Small — S; > Iva ciliata Willd. — S; > Iva ciliata Willd. var. ciliata — G; > Iva ciliata Willd. var. macrocarpa Blake — G. Basionym: Iva annua L. 1753

Links to other floras: = Iva annua - FNA21

Show in key(s)

Show parent genus | Show parent in key(s)

Wetland Indicator Status:

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

Heliophily ⓘ: 8

Your browser does not support SVGs

Hover over a shape, letter, icon, or arrow on the map for definition or see the legend.

image of plant© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Joey Shaw source | Original Image ⭷
image of plant© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷

Feedback

See something missing or incorrect about Iva annua? Let us know here:

  1. Please include your name and if possible, email in case when need to clarify what you wrote.
  2. If you opt out of including email, please be as specific as possible (e.g., which photo is incorrect?)
  3. Please do not submit questions asking to identify plants or about horticultural topics (e.g., how do I control an invasive plant in my garden?). Instead, those questions can be submitted here for the Carolinas region only.
  4. Please do not send us feedback about unkeyed species as this work is ongoing.
  5. Please allow time for flora edits to show in our next data release. We greatly appreciate your feedback but may require extra time to research complicated taxonomic issues.

Horticultural Information

NCBG trait

Intro:

Stems:

Leaves:

Inforescence:

Flowers:

Fruits:

Comments:

Height:

plant sale text:

bloom table text:

description:

stems:

leaves:

inflorescence:

flowers:

fruits:

comments:

cultural notes:

germination code:

native range:



0 unsaved edits on this page.