Lasianthus japonicus Miq. (1867: 110)

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.7571732
persistent identifier	https://treatment.plazi.org/id/43284262-FFD3-FF93-5AB6-FA2F42A8CD48
treatment provided by	Plazi
scientific name	Lasianthus japonicus Miq. (1867: 110)
status

Treatment

34. Lasianthus japonicus Miq. (1867: 110) View in CoL View at ENA — Fig. 58 View FIGURE 58 (plate), Fig. 57 View FIGURE 57 (map)

Type: — JAPAN. Nagasaki, October 1962, S. Coll. 949 (isolectotype K! [K000763881]) .

Lasianthus hartii Franch. (1899: 209) . Type :— CHINA. Fokien, La touche s.n. (holotype P!).

Lasianthus taiheizanensis Masam. & Suzuki (1930: 49) . Type :— CHINA. Taiwan , Taiheizan, Suzuki s.n. (holotype TI!).

Lasianthus japonicus var. lancilimbus (Merr.) H.S.Lo (1999: 99) . Type :— CHINA. Kwangtung , Nam Kwan Shan, Tsang 20293 (holotype IBSC!; isotype K!, NY!).

Lasianthus lucidus Blume (1826: 997) var. caudisepalus Deb & M.Gangop. (1991: 292) . Type:— INDIA. Assam, Cox & Hutchinson 499 (holotype K!; isotype E!).

Specimens examined: — VIETNAM. Norther: Vinh Phuc Province, Tam Dao National Park, 1124 m elev., 13 November 2018, Dang V.S. & Naiki A., Dang 236 & Dang 251 ( VNM, the herbarium of Iriomote Station (Japan )) .

Central: Thua Thien Hue Province , Bach Ma National Park, 1193 m elev., 26 July 2019, Dang V.S. & Naiki A., Dang 372 & Dang 415 ( VNM, the herbarium of Iriomote Station ( Japan)) .

Distribution: —Widespread in tropical and subtropical regions in Asia ( China, India, Japan). In Vietnam, Lasianthus japonicus occurs in Thua Thien Hue, anh Vinh Phuc.

Habitat & Ecology: —Growing under evergreen forest and the edges of the forest at 900–1200 m elev.

Phenology: —Flowering and fruiting from July to December.

Vernacular name: —Xú hưƠng nhật.

Notes: — Lasianthus japonicus is easily identified in the field in having oblong to oblong-lanceolate leaf blade, secondary veins 5–7 on each side of midrib, inflorescences congested-cymose, calyx purple, corolla white at anthesis, and fruits globose, blue to blackish when ripe.