Iva annua L.
Annual Marshelder, Marshelder, Sumpweed, Annual Marsh Elder, Marsh Elder
Asteraceae (Aster Family)
USDA Symbol: IVAN2
From the Image Gallery
Plant CharacteristicsDuration: Annual
Leaf Arrangement: Opposite
Leaf Complexity: Simple
Leaf Shape: Deltoid , Elliptic , Ovate
Inflorescence: Head , Spike
Size Notes: To about 5 feet in height.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom InformationBloom Color: Yellow , Green
Bloom Time: Jul , Aug , Sep , Oct , Nov
DistributionUSA: AL , AR , CO , FL , GA , IA , IL , IN , KS , KY , LA , MA , ME , MI , MO , MS , NC , ND , NE , NM , OH , OK , PA , SC , SD , TN , TX , VA , WI , WV
BenefitUse Food: Cultivated for its seed by indigenous peoples of eastern North America before the arrival of European crops.
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National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Lady Bird Johnson Wildflower Center - Austin, TX
Brackenridge Field Laboratory - Austin, TX
Herbarium Specimen(s)NPSOT 1112 Collected Oct 6, 1994 in Bexar County by Harry Cliffe
BibliographyBibref 1222 - Rivers of Change: Essays on Early Agriculture in Eastern North America (1992) Smith, Bruce D.
Search More Titles in Bibliography
Web ReferenceWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Additional resourcesUSDA: Find Iva annua in USDA Plants
FNA: Find Iva annua in the Flora of North America (if available)
Google: Search Google for Iva annua
MetadataRecord Modified: 2022-12-29
Research By: TWC Staff