"Species Details - Euphorbia hyssopifolia L., University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/1-24454. Accessed 27 Feb. 2025.
Place CollectedNorth America: United States, Arizona, Cochise County, San Pedro Riparian National Conservation Area, Saint DavidDate Collected2013-08-29