Snow, Neil, Marguerite Trost, and John F. Pruski. 2025. “A First Report of Xeranthemum Annuum (Asteraceae: Cardueae) in Montana and North America (U.S.A.)”. Journal of the Botanical Research Institute of Texas 19 (3):335-40. https://doi.org/10.17348/jbrit.v19.i3.1429.