Flora of the Southeastern United States

Ambrosia psilostachya A.P. de Candolle. Common name: Perennial Ragweed. Phenology: Jul-Nov. Habitat: Calcareous prairies (westwards); in loamy sandy soil of flats and slight depressions in periodically burned longleaf pine uplands; also in disturbed areas. Distribution: Michigan west to Montana, south to Louisiana and New Mexico; also scattered along eastern seaboard states (Maine, New Hampshire, New York, North Carolina, South Carolina, Georgia, Florida, Virginia), where perhaps some of the distribution is adventive. In Virginia, apparently first collected in 2000.

Origin/Endemic status: Native

Taxonomy Comments: The native plants of loamy longleaf pine sandhills may be distinct; the name A. rugelii likely applies.

Synonymy ⓘ: = Ar, C, Can, Fl7, FNA21, G, GrPl, Il, K4, Mi, NcTx, NE, NSProv, NY, Oh3, Ok, Pa, POWO, SE1, Tx, McMillan & Prevost (2022); = Ambrosia pilostachya — WH3, misspelling; = Ambrosia rugelii Rydberg — S; > Ambrosia coronopifolia Torrey & A. Gray — K1, NS; > Ambrosia psilostachya DC. — K1, NS, RAB; > Ambrosia psilostachya DC. var. coronopifolia (Torrey & A. Gray) Farwell — F; > Ambrosia psilostachya DC. var. psilostachya — F; > Ambrosia rugelii Rydberg — RAB. Basionym: Ambrosia psilostachya DC. 1836

Links to other floras: = Ambrosia psilostachya - FNA21

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Wetland Indicator Status:

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

Heliophily ⓘ: 8