"Species Details - Smelowskia calycina (Stephan) C. A. Mey. var. americana (Regel & Herder) W. H. Drury & Rollins, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/1-5007/12-121049. Accessed 07 Jan. 2025.
There are 5 specimens of this Species.