Vientiane Prov., Vang Vieng Distr., Na Khun Village, around point 18°52′28”N 102°24′21”E.
Remnants of primary evergreen broadleaved forest on flat alluvial valley at the base of high remnant hills composed with solid marble-like highly eroded rocky limestone at elevation around 300 m a.s.l.
Aquatic submersed plant in shallow water of small stream. Spathe olive-green outside, inside – whitish with numerous small brown marks. Locally common.