Lasianthus giganteus Naiki was described based on plants from Bokor National Park, Kam- pot Province, Cambodia (Naiki et al. 2015). As a small tree, it is distinct from other species of La- sianthus by its thick, coriaceous, larger leaves (21–31 × 9–11 cm) and many persistent bracts and bracteoles densely covered with brown hairs, and large conical fruits 12 mm long and 10 mm in diam. Until now, it was known only from the type locality, but we discovered it in Bach Ma National Park, Thua Thien Hue Province, Central Vietnam in June 2015 (Fig. 1). We also identifed speci- mens from Cambodia, Thailand and Vietnam in the herbaria E and P as L. giganteus (Fig. 1). Since the description of Naiki et al. (2015) lacks a description of the fowers, we provide that information for the frst time based on our newly collected material. Lasianthus giganteus Naiki, Acta Phytotax. Geobot. 66: 165 (2015). –Fig. 2. Typus. Cambodia. Bokor National Park, S. Tagame, K. Fuse, & H.N. Choeun 4279 (holo–KYO!; iso–K, her- barium of the Forest Administration of Cambodia!). Acta Phytotax. Geobot. 68 (1): 59–62 (2017) Short CommuniCation New Localities and Flower Morphology for Lasianthus giganteus (Rubiaceae) akiyo naiki 1,* , ShuiChiro t agane 2 , nguyen V an ngoC 2, 3 , hironori toyama 2 and tetSukazu y ahara 2 1 Iriomote Station, Tropical Biosphere Research Center, University of the Ryukyus, 870 Uehara, Taketomi-cho, Yaeyama-gun, Okinawa 907-1541, Japan. * naiki@lab.u-ryukyu.ac.jp (author for correspondence); 2 Center for Asian Conservation Ecology, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan, 3 Department of Biology, Dalat University, 01 - Phu Dong Thien Vuong, Dalat, Vietnam Lasianthus giganteus Naiki (Rubiaceae), frst found in Cambodia, was recently discovered in central Vietnam and southern Thailand. We describe the foral morphology of this species for the frst time. Key words: Cambodia, Lasianthus giganteus, Rubiaceae, Thailand, Vietnam ISSN 1346-7565 doi: 10.18942/apg.201614 Fig. 1. Distribution of Lasianthus giganteus Naiki. Circle indicates type locality; stars indicated newly discovered localities.