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Disturbed, dry calcareous woodlands. Sometimes on open sites.
Eastern Quebec west to ND, south to GA, AL, and AR.
Similar to A. cylindrica but with 3 or fewer involucral leaves; the main leaflets rhombic-ovate, usually rounded at the base, shallowly cleft, serrate to below the middle, thin.
Flowers June to August
Wetland Indicator: Upland
Compare the thickness and division of the leaves to A. cylindrica
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.
© Michael Hough 2004