Title: Two new species and one new species record of Trichosanthes (Cucurbitaceae) from Vietnam
Abstract: Recent botanical collections made during fieldwork in Vietnam (in the frame of the Russian-Vietnamese co-operation) included two new species of Trichosanthes.Moreover, material of a male flowering specimen of Trichosanthes laceribractea, a species hitherto known as rather widespread in SE China, was found, and documented with herbarium collection and ample photographs.This is quite remarkable as the genus was extensively studied for the treatments of the genus in Cucurbitaceae for Flora of Thailand and for Flora Malesiana (De Wilde & Duyfjes 2008, 2010), and also in a separate article on Trichosanthes in Indochina (De Wilde & Duyfjes 2012).As regards the new species, comparison with Flora of China (Huang et al. 2011) confirmed that similar plants are not known from China either.Female flowers and fruits of the two new species described here as well as the Vietnamese population of T. laceribractea are not known.With the new additions the number of Trichosanthes species in Vietnam has been raised to 15.The new findings corroborate that the genus Trichosanthes is exceptionally rich in species within Cucurbitaceae.