A synopsis of Lasianthus (Lasiantheae, Rubiaceae) in Thailand and two additional new species Author Napiroon, Tiwtawat 0000-0002-4710-5016 Biology major, Faculty of Science & Technology, Pibulsongkram Rajabhat University, Phitsanulok 65000, Thailand napiroont@gmail.com Author Chayamarit, Kongkanda 0000-0003-1057-6380 The Forest Herbarium (BKF), Department of National Parks, Wildlife and Plant Conservation, Bangkok, 10900, Thailand kchayamarit@gmail.com Author Dawson, Sally 0000-0002-8178-0912 Identification and Naming Department, Royal Botanic Gardens, Kew, Richmond, Surrey, TW 9 3 AE, United Kingdom S.Dawson@kew.org Author Till, Walter 0000-0001-9329-4340 Department of Botany and Biodiversity Research, Faculty of Life Science, University of Vienna, Rennweg 14, A- 1030, Austria walter.till@univie.ac.at Author Balslev, Henrik 0000-0002-7101-7120 Section Ecoinformatics and Biodiversity, Department of Bioscience, Faculty of Science and Technology, Aarhus University, Aarhus 8000, Denmark henrik.balslev@bios.au.dk text Phytotaxa 2020 2020-04-15 439 1 1 38 http://dx.doi.org/10.11646/phytotaxa.439.1.1 journal article 10.11646/phytotaxa.439.1.1 1179-3163 13873503 32. Lasianthus loeiensis Zhu (2002:576) . Type:THAILAND . Loei , Phu Kradung National Park, 16 November 1979 , T. Shimizu, H. Toyokuni, H. Koyama, T. Yahara & C. Niyomdham T-23031 ( holotype L0305809 image!). T hailand: ―NORTH-EASTERN. Loei : Phu Kradung National Park, 24 December 1971 , G. Murata et al. T42857 (BKF, L), 16 November 1979 , C. F. van Beusekom et al. 4562 (BKF, K, L), 16 November 1979 , T. Shimizu et al. T23033 (BKF, L), 31 August 1988 , H. Takahashi & M. N. Tamura T63298 (BKF). Distribution: ―Endemic to Thailand (North-Eastern). Ecology: ―Hill evergreen forest at an elevation of 1000‒1250 m . Flowering and fruiting in November– December. Notes: Lasianthus loeiensis occurs only in north-eastern Thailand . It is similar to L. formosensis but differs by having elliptic-lanceolate leaves (not ovate-elliptic), the adaxial midrib hirsute (not glabrous), linear-lanceolate stipules (triangular), and linear bracts (not absent).