Lasianthus tamdaoensis V.S. Dang (2020: 51)

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.7571890
persistent identifier	https://treatment.plazi.org/id/43284262-FF1F-FF5E-5AB6-FD164110C969
treatment provided by	Plazi (2023-01-26 05:55:47, last updated 2023-11-08 12:54:13)
scientific name	Lasianthus tamdaoensis V.S. Dang (2020: 51)
status

Treatment

66. Lasianthus tamdaoensis V.S. Dang (2020: 51) View in CoL — Fig. 97 View FIGURE 97 (plate), Fig. 94 View FIGURE 94 (map)

Type: — VIETNAM. Vinh Phuc Province, Tam Dao National Park , 75 km north of Ha Noi City , 1124 m elev., 13 November 2018, Dang V.S. & Naiki A., Dang 242 (holotype VNM! [ VNM00042938 View Materials ]; isotypes HN!, KYO!, VNM! [ VNM00042939 View Materials ], VNMN!) .

Specimens examined: — VIETNAM. Northern: Vinh Phuc Province, Tam Dao National Park, 75 km north of Ha Noi City, 1124 m elev., 13 November 2018, Dang V.S. & Naiki A., Dang 243 ( VNM, the herbarium of Iriomote Station (Japan)); Ha Noi City, Ba Vi National Park , 50 km west of Ha Noi city center, 1267 m elev., 17 November 2018, Dang V.S. & Naiki A., Dang 271 ( VNM, the herbarium of Iriomote Station (Japan )) .

Distribution: —Endemic to Vietnam (currently known as Tam Dao National Park of Vinh Phuc Province and Ba Vi National Park of Ha Noi City).

Habitat & Ecology: —Growing under the shade of evergreen forest or the edge of the evergreen montane forest at 1000–1300 m elev.

Phenology: —Flowering and fruiting from June to December.

Vernacular name: —Xú hưƠng tam đảo.

Notes: — Lasianthus tamdaoensis was described as new from a Vietnamese specimen (Dang 242) by Dang & Naiki (2020). This species is easily identified in the field in having densely appressed pubescent to strigose on branches, ovate to ovate-oblong leaves, secondary veins 5–6 on each side of midrib, flowers white, and fruits ovoid or globose, blue when ripe.

References

Dang, V. S. & Naiki, A. (2020) Two new species of Lasianthus (Rubiaceae) from northern Vietnam. Annales Botanici Fennici 57: 49 - 54. https: // doi. org / 10.5735 / 085.057.0106

Figures

FIGURE 94. Distribution maps of Lasianthus sikkimensis, L. sonlangensis, L. stephanocalycinus and L. tamdaoensis.

FIGURE 97. Lasianthus tamdaoensis V.S.Dang (A–F from Dang 243 and G–J from Dang 271, VNM and the herbarium of Iriomote Station (Japan)): A. Branch with flowers, B. Close-up of expanding young leaves, C. Stipules, D.Abaxial leaf surfaces, E–G. Inflorescence showing side view calyx and flower buds, H–I. Flower and mature fruits, J. Seeds.