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Vernonia Schreber. Ironweed.

Key to Vernonia

A genus of about 20 species, perennial herbs, of e. and c. North America and n. Mexico; a few species in South America. Traditionally very broadly circumscribed to include about 500 species, trees, shrubs, and herbs, of tropical, subtropical, and warm temperate regions, especially America and Africa; this broader circumscription appears increasingly indefensible.

Key advice:Hybrids are frequent between co-occurring species. Only V. ×georgiana is keyed separately below (because of its distinctive appearance). Others may be recognized by intermediate morphology and ecological / geographic context.

Ref: Faust (1972); Jones (1982); Jones In Cronquist (1980); Siniscalchi et al. (2019); Strother (2006l) In Flora of North America Editorial Committee (2006a); Urbatsch (1972); Ward (2012a). Show full citations.

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Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

image of plant© Paul Marcum | Vernonia missurica source | Original Image ⭷
image of plant© Paul Marcum | Vernonia missurica source | Original Image ⭷
image of plant© Gary P. Fleming | Vernonia glauca | Original Image ⭷
image of plant© Deb Tyler, some rights reserved (CC BY-NC), uploaded by Deb Tyler | Vernonia baldwinii var. baldwinii source | Original Image ⭷
image of plant© Keith Bradley | Vernonia blodgettii | Original Image ⭷

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See something wrong or missing on about Vernonia? Let us know here: (Please include your name and email if at all complicated so we can clarify if needed.) We greatly appreciate feedback, and will include updates from you in our next webapp update, which can take a few months.