[1]
K. E. Dumaw, K. M. Pryer, M. D. Windham, and N. M. Hay, “Herbarium specimens reveal a significantly earlier flowering trend for Cypripedium acaule (Orchidaceae) in North Carolina (U.S.A.)”, J. Bot. Res. Inst. Texas, vol. 19, no. 3, pp. 211–221, Sep. 2025.