Lasianthus chrysoneurus (Korth.) Miq. (1857: 322)

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.7571622
persistent identifier	https://treatment.plazi.org/id/43284262-FFB1-FFF0-5AB6-FDEB43FCC980
treatment provided by	Plazi (2023-01-26 05:55:47, last updated 2023-11-08 12:54:13)
scientific name	Lasianthus chrysoneurus (Korth.) Miq. (1857: 322)
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Treatment

14. Lasianthus chrysoneurus (Korth.) Miq. (1857: 322) View in CoL View at ENA — Fig. 33 View FIGURE 33 (plate), Fig. 32 View FIGURE 32 (map)

Type: — INDONESIA. Java, Jawa Barat, 1917, Backer 22515 (neotype L! [L0306249], designated by Zhu 2002) .

Mephitidia chrysoneura Korth. (1851: 222) . Type:— INDONESIA. Java, Jawa Barat, 1917, Backer 22515 (neotype L! [L0306249], designated by Zhu 2002).

Lasianthus kurzii Hook.f. (1880: 183) . Type :— MYANMAR. Chopedang, 1827, Wall. Cat. 8310 (holotype K! [K000031671].

Lasianthus hoaensis Pierre ex Pit. (1924: 383) . Type:— VIETNAM. Dong Nai Province, Bien Hoa, Pierre 1316 (syntype P!; isosyntypes BM!, E!, K!).

Lasianthus hoaensis var. microphyllus Pit. (1924: 383) . Type :— CAMBODIA. Mont. de l’Lephant, 6 August 1919, Poilane s.n. (lectotype P! [P02285244], designated by Napiroon et al. 2020).

Specimens examined: — VIETNAM. Central: Dak Nong Province, Gia Nghia District , 810 m elev., 9 May 2019, Dang V.S. & Hoang N.S., Dang 301 ( VNM) ; in the same location, Ta Dung National Park , 680 m elev., 11 June 2019, Dang V.S. & Hoang N.S., Dang 310 ( VNM) ; Gia Lai Province, Kon Ka Kinh National Park , 887 m elev., August 2019, Oguri E., Tagane S., Sugai K., Suyama Y. & Bui H.Q. V10916 & V10994 ( HN, KAG, MAK, VNM) . Southern: Dong Nai Province, Xuan Loc District, Nui Chua Chan , 20 August 1931, Poilane 19336 ( VNM) ; in the same location, 750 m elev., 24 August 1931, Poilane 18381 ( VNM) .

Distribution: —Widespread in tropical and subtropical regions in Asia ( Cambodia, China, India, Indonesia, Laos, Myanmar, Papua New Guinea, Thailand). In Vietnam, Lasianthus chrysoneurus occurs in Dak Nong, Dong Nai, Gia Lai, and Lam Dong.

Habitat & Ecology: —Growing in primary and secondary montane forests or open areas at 600–1000 m elev.

Phenology: —Flowering and fruiting from May to October.

Vernacular name: —Xú hưƠng biên hòa.

Notes: — Lasianthus chrysoneurus was clarified in the revisions by Zhu & Taylor (2011), Zhu et al. (2012), and Napiroon et al. (2020). This species is easily recognizable in the field in having appressed pubescent branches, stipules up to 8 mm long, bracts 5 mm long, and fruits subglobose, white when ripe.

References

Napiroon, T., Chayamarit, K., Dawson, S., Till, W. & Balslev, H. (2020) A synopsis of Lasianthus (Lasiantheae, Rubiaceae) in Thailand and two additional new species. Phytotaxa 439 (1): 1 - 38. https: // doi. org / 10.11646 / phytotaxa. 439.1.1

Zhu, H. & Taylor, C. M. (2011) Lasianthus. In: Wu, Z. Y., Raven, P. H. & Hong, D. Y. (Eds.) Flora of China, vol. 19. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, pp. 185 - 198.

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 32. Distribution maps of Lasianthus chinensis, L. chrysoneurus, L. curtisii and L. dakglaiensis.

FIGURE 33. Lasianthus chrysoneurus (Korth.) Miq. (A–F from Dang 301 and G from V10916, VNM and HN): A. Branch with flower buds, B. Close-up of young branch and leaves, C. Stipules, D. Abaxial leaf surfaces, E–F. Inflorescence showing side view flower buds and bracts, G. Young and mature fruits (G: photos by Shuichiro Tagane).

Abbreviations

VNM	Institute of Tropical Biology
HN	National Center for Natural Sciences and Technology
KAG	Kagoshima University Museum - Herbarium
MAK	Tokyo Metropolitan University