Vernonia fasciculata Michx. - Common Ironweed


 

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Vernonia fasciculata - (image 1 of 5)

 

Taxonomy

Family: Asteraceae

Habitat

Moist open habitats. Moist prairies, alluvial terraces, marshes.

Associates

 

 Distribution

OH, IN and KY west to ND and MT, south AR to CO. May have been introduced further east.

Morphology

Herbaceous perennial to 1.4 m. Stems often red or purple, mostly glabrous but often puberulent above. Leaves alternate, sessile or subsessile, glabrous, denticulate to sharply serrate, pitted-punctate beneath. Inflorescence flat and dense, to 10 cm wide; flowers 10-26; involucre 5-9 mm, the principle bracts rounded to subacute, entire or sparsely ciliate, often glabrous on the back; pappus tawny to purple.

Notes

Flowers mid July to early October

Wetland indicator: Facultative Wetland

There are two varieties. The more eastern variety is var. fasciculata and occurs from OH, IN, and KY to MN, eastern NE, eastern KS, and eastern OK.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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 Michael Hough 2005