Lasianthus sikkimensis Hook.f. (1880: 180)

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.7571886
persistent identifier	https://treatment.plazi.org/id/43284262-FFE4-FFA5-5AB6-FD1F4110CA58
treatment provided by	Plazi (2023-01-26 05:55:47, last updated 2023-11-08 12:54:13)
scientific name	Lasianthus sikkimensis Hook.f. (1880: 180)
status

Treatment

63. Lasianthus sikkimensis Hook.f. (1880: 180) View in CoL View at ENA — Fig. 93 View FIGURE 93 (plate), Fig. 94 View FIGURE 94 (map)

Type: — INDIA. Sikkim, Hooker & Thomson 11 (holotype K! [K000031598]; isotypes L! [L0000706, L0000705], LE! [ LE00017554 ]) .

Lasianthus tsangii Merr. ex H.L.Li (1943: 457) . Type:— CHINA. Kwangsi (Guangxi), W.T.Tsang 23940 (holotype IBSC!).

Lasianthus baviensis (Drake) Pit. (1924: 380) . Type:— VIETNAM. Ha Noi City, Ba Vi District , 1 July 1887, Balansa 2655 (holotype P! [P04009933]; isotype K! [K000777006]).

Lasianthus langkokensis (Drake) Pit. (1924: 397) . Type:— VIETNAM. Ha Noi City, Ba Vi District , 1 October 1887, Balansa 2654 (holotype P!).

Specimens examined: — VIETNAM. Northern: Vinh Phuc Province, Tam Dao National Park, 1124 m elev., 13 November 2018, Dang V.S. & Naiki A., Dang 237 ( VNM, the herbarium of Iriomote Station (Japan)); Ha Noi City, Ba Vi National Park , 1267 m elev., 17 November 2018, Dang V.S. & Naiki A., Dang 281 ( VNM, the herbarium of Iriomote Station (Japan )) .

Distribution: —Widespread in the tropical and subtropical regions in Asia ( Bangladesh, China, India, Malaysia, Philippines, Thailand). In Vietnam, Lasianthus sikkimensis occurs in Ha Noi, Hoa Binh, and Vinh Phuc.

Habitat & Ecology: —Growing in the shade of evergreen forest or the hill of evergreen montane forest at 700– 1300 m elev.

Phenology: —Flowering and fruiting from July to November.

Vernacular name: —Xú hưƠng ba vì, Xú hưƠng lăng cốc.

Notes: — Lasianthus sikkimensis was described in 1880 by Hooker. It was clarified in the revision by Zhu et al. (2012) and two Vietnamese species, L. langkokensis (Drake) Pit. (1924: 397) and L. baviensis (Drake) Pit. (1924: 380) were treated as the synonyms of L. sikkimensis .

This species is easily identified in the field by having densely brown-tomentose on branches, leaf blade ellipticlanceolate or elliptic, 10–20 cm long, bracts linear to lanceolate, 0.5–2 cm long, brown-tomentose, and fruits ellipsoid, blue when ripe.

References

Zhu, H., Roos, M. C. & Ridsdale, C. E. (2012) A taxonomic revision of the Malesian species of Lasianthus (Rubiaceae). Blumea 57: 1 - 102. https: // doi. org / 10.3767 / 000651912 X 652012

Figures

FIGURE 93. Lasianthus sikkimensis Hook.f. (from Dang 281, VNM and the herbarium of Iriomote Station (Japan)): A. Habit, B. Branch, C. Stipules, D. Abaxial leaf surfaces, E–G. Inflorescence showing side view bracts, buds and flowers, H. Young fruits, I–J. Mature fruits.