Abstract
This is the first report of Aphyllorchis montana var. rotundatipetala, a peloric variant of A. montana from Amami-Oshima Island, Ryukyu Islands, southern Japan, previously reported only from Taiwan. It can be distinguished from A. montana var. montana by its sub-actinomorphic flowers, a labellum that is not divided into hypochile and epichile, and a reduced stigma. Additionally, A. montana var. rotundatipetala can be distinguished from A. simplex from Vietnam and southern China—another probable peloric, sub-actinomorphic form of A. montana—by its obtuse lip apex (vs. acute in A. simplex), a highly reduced rostellum (vs. the prominent erect ligulate rostellum in A. simplex), and inconspicuous apical staminodes on both sides of the column (vs. two large, curved staminodes in A. simplex).
