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A. A. Reznicek
Disturbed, sunny areas. A European subshrubby perennial forming small, evergreen mounds. Often cultivated and known from a few collections outside of cultivation. The flowers are white and the inflorescences elongate in fruit, as in I. amara; I. sempervirens has narrow, entire leaves, whereas I. amara has toothed, ± oblanceolate leaves. First collected by H. Gall in Benzie Co. in 1979.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 20, 2018. https://www.michiganflora.net/species.aspx?id=657.