Dumaw KE, Pryer KM, Windham MD, Hay NM. Herbarium specimens reveal a significantly earlier flowering trend for Cypripedium acaule (Orchidaceae) in North Carolina (U.S.A.). J. Bot. Res. Inst. Texas [Internet]. 2025 Sep. 23 [cited 2025 Sep. 27];19(3):211-2. Available from: https://journals.brit.org/jbrit/article/view/1424