United States, Illinois, DuPage, Morton Arboretum, Along the E shoulder of IL 83 in Willowbrook, beginning 110' S of Midway Dr., extending S for 45', and measuring 15' across in the E-W direction.
A well-established, dense colony of plants. This collection is a duplicate of Dritz 453 (at MOR). Later collections were made on June 2, 1986 (Dritz 462 at MOR, with additional associates) and June 17, 1986 (Dritz 478 at MOR). Other names used for this plant are A. micrantha Suksd., A. hispida (R. & P.) Johnston, and A. parviflora Heller.