New Combinations of White Flowered Forms of Pontederia korsakowii (Pontederiaceae) and Cynanchum rostellatum (Apocynaceae)

Abstract

The white flowered form of Monochoria korsakowii Regel & Maack was described in Japan in 1929 and that of Metaplexis japonica (Thunb.) Makino in 1946. New combinations of these forms are proposed under currently accepted names Pontederia korsakowii (Regel & Maack) M.Pell. & C.N.Horn for the former and Cynanchum rostellatum (Turcz.) Liede & Khanum for the latter: P. korsakowii f. albiflora (Makino) H.Ohashi & K.Ohashi and C. rostellatum f. albiflorum (Honda) H.Ohashi & K.Ohashi, respectively. The lectotype of Monochoria korsakowii var. albiflora Makino is designated and its photograph is presented.