M. R. Shrestha and S. K. Ghimire, “<i>Pegaeophyton scapiflorum</i> (J.D. Hooker & Thomson) C. Marquand & Airy Shaw subsp. <i>scapiflorum</i> (Cruciferae), a new record for Nepal flora”, Botanica Orientalis, vol. 4, no. 1, pp. 112–113, Aug. 2007.