Dumaw, Kylie E., Kathleen M. Pryer, Michael D. Windham, und Nikolai M. Hay. „Herbarium Specimens Reveal a Significantly Earlier Flowering Trend for Cypripedium Acaule (Orchidaceae) in North Carolina (U.S.A.)“. Journal of the Botanical Research Institute of Texas 19, no. 3 (September 23, 2025): 211–221. Zugegriffen September 27, 2025. https://journals.brit.org/jbrit/article/view/1424.