Lasianthus biflorus (Blume) M.Gangop. & Chakrab. (1992: 338)

Dang, Van-Son & Naiki, Akiyo, 2023, A revision of the genus Lasianthus Jack (Rubiaceae) from Vietnam, Phytotaxa 581 (1), pp. 1921-1935 : 1921-1935

publication ID	https://doi.org/ 10.11646/phytotaxa.581.1.1
DOI	https://doi.org/10.5281/zenodo.7571576
persistent identifier	https://treatment.plazi.org/id/43284262-FF85-FFC2-5AB6-F9C54398C46E
treatment provided by	Plazi
scientific name	Lasianthus biflorus (Blume) M.Gangop. & Chakrab. (1992: 338)
status

Treatment

5. Lasianthus biflorus (Blume) M.Gangop. & Chakrab. (1992: 338) View in CoL View at ENA — Fig. 19 View FIGURE 19 (plate), Fig. 20 View FIGURE 20 (map)

Type: — INDONESIA. Java, Blume s.n. (lectotype L! [L0000722], designated by Zhu 2002) .

Litosanthes biflora Blume (1823: 22) View in CoL . Type:— INDONESIA. Java, Blume s.n. (lectotype L! [L0000722], designated by Zhu 2002).

Lasianthus gracilis King & Gamble (1904: 132) View in CoL . Type:— MALAYSIA. Perak, Tea Gardens, Ridley 2904 (lectotype SING! [ SING0059255 ], designated by Wong 1988).

Specimens examined: — VIETNAM. Central: Gia Lai Province, Mang Yang District, 1000–1200 m elev., 15 August 1930, Poilane 18003 (P); Kon Tum Province, Ngoc Linh Nature Reserve , 1141 m elev., 10 February 2017, Tagane S., Nagamasu H., Nguyen V.N., Hoang T.B., Hoang T.S., Yang C.J., Kawakubo A. V 6099 ( DLU, FU, the herbarium of Iriomote Station ( Japan)); Gia Lai Province, Kon Chu Rang Nature Reserve , 920 m elev., 19 August 2019, Oguri E., Tagane S., Sugai K., Suyama Y. & Bui H.Q. V10401 View Materials ( HN, VNM) ; in the same location, 1050 m elev., 21 April 2021, Dang V.S. & Truong B.V., Dang 459 ( VNM) .

Distribution: —Widespread in tropical and subtropical regions in Asia ( Cambodia, China, Indonesia, Malaysia, Philippines, Thailand). In Vietnam, Lasianthus biflorus occurs in Gia Lai and Kon Tum.

Habitat & Ecology: —Growing in lower montane evergreen forest and at the edge of the evergreen forest at 700– 1200 m elev. The forest habitats are dominated by species of Rubiaceae , Fagaceae , Lauraceae , Myrtaceae , Clusiaceae , and Fabaceae .

Phenology: —Flowering and fruiting from August to December.

Vernacular name: —Xú hưƠng lá nhỏ.

Notes: — Lasianthus biflorus was first recorded for the flora of Vietnam by Zhu & Taylor (2011). Currently, this species is known from Ngoc Linh Nature Reserve of Kon Tum Province and Kon Chu Rang Nature Reserve of Gia Lai Province, Southern Vietnam. It is easily recognizable in the field in having the small size of leaves and flowers, inflorescences with peduncles up to 2 cm long, and black fruit when ripe.