Lasianthus naikii V.S.Dang & Vuong (2022: 20)

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

49. Lasianthus naikii V.S.Dang & Vuong (2022: 20) — Fig. 76 (plate), Fig. 73 (map)

Type: — VIETNAM. Gia Lai Province, K’Bang District, Son Lang Commune, Kon Chu Rang Nature Reserve , 1000–1100 m elev., 22 April 2021, Van-Son Dang, Ba Vuong Truong, Minh Quan Dang & Nghia Son Hoang, Dang 453 (holotype VNM! [ VNM00042916 ]; isotypes HN!, VNM! [ VNM00042917 , VNM00042918 ]) .

Specimens examined: — VIETNAM. Central: Gia Lai Province, K’Bang District, Son Lang Commune, Kon Chu Rang Nature Reserve , 1050 m elev., 25 April 2021, Van-Son Dang, Ba Vuong Truong, Minh Quan Dang & Nghia Son Hoang, Dang 453a ( VNM) .

Distribution: —Endemic to Vietnam (currently known only at Kon Chu Rang Nature Reserve of Gia Lai Province).

Habitat & Ecology: — Lasianthus naikii grows under the shade of the primary evergreen forest at an elevation of 1000–1100 m.

Phenology: —Flowering and fruiting from February to August.

Vernacular name: —Xú hưƠng naiki.

Notes: — Lasianthus naikii was described from a Vietnamese specimen (Dang 453, VNM) by Dang et al. (2022). It is similar to L. formosensis Matsum. (1901: 17) , but differs from the latter in having less than secondary veins, bracts present (vs. absent), longer calyx tubes, and corolla lobes 6 (vs. 5).

Figures

FIGURE 73. Distribution maps of Lasianthus longissimus, L. lucidus, L. micranthus and L. naikii.

FIGURE 76. Lasianthus naikii V.S.Dang & Vuong (from Dang 453, VNM): A. Branche, B. Stipules, C. Abaxial leaf surfaces, D. Calyces, E–F. Close-up of flowers, G–H. Mature fruits, I. Seeds.