Аннотация:Lophocolea sikkimensis, a little-known Sino-Himalayan species, was collected in North Vietnam and itstaxonomic position was identified by molecular genetic techniques. The species is characterized by generallynarrowly pointed leaves, which are not seen in other representatives of Lophocoleaceae. We found that itbelongs to the recently described genus Cryptolophocolea, although it is clearly morphologically dissimilarto other members of the genus. We propose a corresponding nomenclature combination: Cryptolophocoleasikkimensis comb. nov. This species is the only one in its genus with a predominantly Sino-Himalayandistribution; the vast majority of congeners are distributed in the Southern Hemisphere (mostly inAustralasia). Reports of this species in Vietnam further confirm the close phytogeographic relationships ofthe flora of northern Indochina with those of the Sino-Himalayas and suggest that this species is found inother parts of the Hoang Lien Range and the southern Hengduan Range.