N. Vietnam, prov. Son La, distr. Moc Chau, municipality Chieng Hac, vicinities of Co Liu village (N 20°51′ E 104°38′). Remnants of primary evergreen broadleaved forests on vertical limestone bluffs along Xap river canyon at 550-600 m elev. Terrestrial and lithophyte plants with underground tuber-like stem up to 20 cm in diam and 0.5 m lg. Leaves up to 2 m lg. Common (up to elevations 1240 m).
NTH 2920 28 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)