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A new genus and species – Hiepia corymbosa(Apocynaceae, Asclepiadoideae) discovered in Quang Binh and Quang Tri provinces of central Vietnam is described and illustrated. The morphological characters of dis-covered new genus and related genera Dischidiaand Hoyaare compared. From both mentioned genera, the described plant differs in revolute petals, flat corymbiform inflorescence, not spreading corona lobes and in very long filiform pollinaria translators.
This paper provides new data on 33 new or rare species of Hoya obtained in feldwork mainly during 2012–2017 in eastern Indochina including Cambodia, Laos and Vietnam. These data include illustrated descriptions of three species new for science, as well as illustrated records of 24 species new for the ﬂoras of the studied countries. When these new data are included, the ﬂora of eastern Indochina comprises at least 45 species. Among them eight species are recorded and documented for Cambodia, 21 sp. for Laos and 40 sp. for Vietnam; two new species are described in Vietnam (H. crassipetiolata and H. nutans) and one species is described from Laos (H. uniﬂora). Eighteen species were recorded newly for the ﬂora of Vietnam (H. arnottiana, H. burmanica, H. chinghungensis, H. erythrina, H. erythrostemma, H. fungii, H. griffthii, H. hainanensis, H. lanceolata, H. linearis, H. loyceandrewsiana, H. mengtzeensis, H. nummularioides, H. pachyclada, H. pandurata, H. parviﬂora, H. revolubilis, H. vaccinioides), nine for Laos (H. arnottiana, H. carnosa, H. chinghungensis, H. fungii, H. globulosa, H. griffthii, H. linearis, H. pandurata, H. polyneura) and two for Cambodia (H. lobbii, H. multiﬂora). New localities were discovered for H. bonii, H. lockii, H. lyi, H. micrantha, H. multiﬂora, H. oblongacutifolia, and H. verticillata known earlier in Cambodia, Laos and Vietnam by few collections. Lectotypes are proposed for the following eight species: H. arnottiana, H griffthii, H. lanceolata, H. lobbii, H. nummularioides, H. oblongacutifolia, H. pachyclada, and H. vaccinioides. Names of five taxa earlier known as separate species (H. villosa, H. pseudovalifolia, H. graveolens, H. balansae) are regarded as synonyms of H. globulosa, H. micrantha, H. oblongacutifolia, H. verticillata respectively