102 urn:lsid:arphahub.com:pub:73abe0ce-d97c-5d7c-bee5-b8e6e6fe6a17 ARPHA Preprints preprints Pensoft Publishers 10.3897/arphapreprints.e69957 69957 Research Article Gesneriaceae Floristics & Distribution Taxonomy Asia Hemiboea chanii (Gesneriaceae), a new species from limestone areas of northern Vietnam Nguyen Cuong Huu nguyenhuucuong.tvr@gmail.com https://orcid.org/0000-0003-2281-741X 1 2 Nguyen Ly Van lynguyenvnuf@gmail.com 1 Nguyen Khang Sinh nskhang@gmail.com 3 Egorov Alexander A egorovfta@yandex.ru 4 Averyanov Leonid V av_leonid@mail.ru 5 Vietnam National University of Forestry, Ha Noi, Vietnam Vietnam National University of Forestry Ha Noi Vietnam Saint-Petersburg State Forestry University, Cankt-Peterburg, Russia Saint-Petersburg State Forestry University Cankt-Peterburg Russia Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Cau Giay, Hanoi, Vietnam, Ha Noi, Vietnam Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Nghia Do, Cau Giay, Hanoi, Vietnam Ha Noi Vietnam St. Petersburg State University, St.Petersburg, Russia St. Petersburg State University St.Petersburg Russia Komarov Botanical Institute of the Russian Academy of Science, St. Petersburg, Russia Komarov Botanical Institute of the Russian Academy of Science St. Petersburg Russia

Corresponding authors: Cuong Huu Nguyen (nguyenhuucuong.tvr@gmail.com), Ly Van Nguyen (lynguyenvnuf@gmail.com), Khang Sinh Nguyen (nskhang@gmail.com), Alexander A Egorov (egorovfta@yandex.ru), Leonid V Averyanov (av_leonid@mail.ru).

Academic editor:

2021 11 06 2021 1 2709B001-8242-5CA3-9D4B-AD0AA37DDFB7 10 06 2021 10 06 2021 Cuong Huu Nguyen, Ly Van Nguyen, Khang Sinh Nguyen, Alexander A Egorov, Leonid V Averyanov This is an open access preprint distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Hemiboea chanii, a new species of Gesneriaceae from Ha Giang Province, northern Vietnam, is here described and illustrated. It has many branched stems up to 90 cm, with 12–16 nodes, involucre diamond with two cirrose opposite apexs, pink corolla with red spotted inside, and flowering time in January–February. Among congeners with abaxially hairy corolla new species morphologically most close to H. crystallina and H. sinovietnamica. Diagnostic discriminative features between all mentioned species are discussed.