Lasianthus kbangensis V. S. Dang, Vuong & Naiki 2022

35. Lasianthus kbangensis V.S.Dang, Vuong & Naiki (2022: 292) — Fig. 59 (plate), Fig. 57 (map) Type: — VIETNAM. Gia Lai province, K’Bang district, Kon Chu Rang Nature Reserve, 1015 m elev., 20 April 2021, Van-Son Dang, Ba Vuong Truong, Ngoc Minh Tam Thao Duong, Ngan Thi Kim Le & Dinh Hiep Nguyen, Dang 463 (holotype VNM! [VNM00045839]; isotypes HN! VNM! [VNM00045840]). Specimens examined: — VIETNAM. Central: Gia Lai Province, K’Bang District, Kon Chu Rang Nature Reserve, 1010 m elev., 24 April 2021, Van-Son Dang, Ba Vuong Truong, Ngoc Minh Tam Thao Duong, Ngan Thi Kim Le & Dinh Hiep Nguyen, Dang 463a (VNM). Distribution: —Endemic to Vietnam (currently known only from Kon Chu Rang Nature Reserve of Gia Lai Province). Habitat & Ecology: — Lasianthus kbangensis is easily found under the shade of the primary evergreen forest at an elevation of 1000–1100 m. Phenology: —Flowering and fruiting from March to September. Vernacular name: —Xú hưƠng kbang. Notes: — Lasianthus kbangensis was described from a Vietnamese specimen (Dang 463) by Nguyen et al. (2022). It is similar to L. oblongilobus H.Zhu (2002: 400) in its shrub habit, smooth on branches and branchlets, and glabrous leaves, but differs in having larger leaf blades, longer petioles, calyx lobes 4 (vs. 5), smaller corolla. Fruit color is also different when ripe.Published as part of Dang, Van-Son & Naiki, Akiyo, 2023, A revision of the genus Lasianthus Jack (Rubiaceae) from Vietnam, pp. 1921-1935 in Phytotaxa 581 (1) on pages 1921-1935, DOI: 10.11646/phytotaxa.581.1.1, http://zenodo.org/record/757155