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Explore our comprehensive guide on True (Rough) Marsh Elder pollen, including allergen details, locations across the US, and botanical insights for healthcare providers and patients managing pollen allergies.
Iva annua, the annual marsh elder[3] or sumpweed, is a North American herbaceous annual plant in the family Asteraceae that was historically cultivated by Native Americans for its edible seed. Description. Iva annua is an annual herb up to 150 cm (5 feet) tall.
Iva annua L. (Marsh-elder, Pelocote, Rough marsh-elder, Sumpweed, Annual marsh elder, Annual marshelder, Seacoast sumpweed). Family Asteraceae. Genus Iva. World flora
Not reaching farther north than Pennsylvania in its native range, rough marsh-elder is non-native in New England, but a common annual elsewhere in North America. Like ragweed, it is a source of allergenic airborne pollen.
iNaturalist UK iNaturalist UK is the product of a membership agreement between the iNaturalist Network and the National Biodiversity Network Trust, the Marine Biological Association and the Biological Records Centre.
Another species, rough marshelder (I. ciliata) is similar in height, but has longer flowering structures with a rough appearance. Dune and coastal marshelders are native to coastal areas in the east and southeast US.
The Marsh Elder is a tardily deciduous maritime shrub that is native to coastal saline wetlands in the southeastern part of the country. Its native habitat includes the saline grasses and rushes. The leaves of this shrub are dull green and lanceolate and have serrate margins.
