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 31. Lasianthus lineolatus Craib (1933:22) . Type : ― THAILAND . Surat Thani , Kao Nawng (probably a misspelling for Khao Nang), 10 April 1927 , A. F. G. Kerr 13284 ( holotype K000777020!; isotype BK257387!). T hailand: ―PENINSULAR. Nakhon Si Thammarat : Khoa Luang National Park, 21 January 1966 , M. Tagara, K. Iwatsuki & N. Fukuoka T4860 (BKF). Distribution: ―Endemic to Thailand (Peninsular). Ecology: ―Grows at high elevation of 1000‒1100 m in Peninsular Thailand . Notes: ―Apart from the type specimen we know this species from only very few collections and field observations. The original description and some morphological character of the type specimen, however, suggests it is different from other Thai Lasianthus species. It is included in World Checklist of Selected Plant Families (http://wcsp.science.kew. org/). It is similar to L. ellipticus but differs by having lanceolate, 3 mm long calyx lobes (not narrowly triangular, 1 mm long), pilose corolla lobes and tube (not corolla lobes hirsute outside, floccose inside and corolla tube glabrous).