Lasianthus nghiasonii V.S.Dang & Naiki (2021: 34)

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.7571822
persistent identifier	https://treatment.plazi.org/id/43284262-FFF9-FFB7-5AB6-F8DA40D9CEC4
treatment provided by	Plazi
scientific name	Lasianthus nghiasonii V.S.Dang & Naiki (2021: 34)
status

Treatment

50. Lasianthus nghiasonii V.S.Dang & Naiki (2021: 34) — Fig. 77 View FIGURE 77 (plate), Fig. 78 View FIGURE 78 (map)

Type: — VIETNAM. Lam Dong Province, Bidoup Nui Ba National Park , 1464 m elev., 26 February 2016, Tagane S., Dang V.S., Nguyen V.N., Wai J. V 4450 ( holotype VNM! [ VNM00042919 View Materials ]; isotype FU!, VNM! [ VNM00042920 View Materials , VNM00042921 View Materials ], the herbarium of Iriomote Station ( Japan)) .

Specimens examined: — VIETNAM. Central: Lam Dong Province, Bidoup Nui Ba National Park , 1464 m elev., 12°10’17.02’’N, 108°41’50.01’’E, in lower montane evergreen forest, 26 February 2016, Tagane S., Dang V.S., Nguyen GoogleMaps V.N., Wai J. V 4450 ( FU, VNM, the herbarium of Iriomote Station ( Japan)); in the same location, 1533 m elev., 12°10’34.07’’N, 108°41’08.04’’E, in lower montane evergreen forest, 21 February 2016, Tagane S., Nagamasu H., Naiki A., Dang V.S., Nguyen GoogleMaps V.N., Hoang T.B., Wai J. V 3987 ( FU, VNM, the herbarium of Iriomote Station ( Japan)); in the same location, 1438 m elev., 12˚10’23.01”N, 108˚41’52.20’’E, 26 November 2017, in moist evergreen forest, Naiki A. & Dang V.S. 10101, 10102, 10103 ( VNM, the herbarium of Iriomote Station ( Japan)). Khanh Hoa Province , Hon Ba Nature Reserve , 1521 m elev., 12°07’01.82’’N, 108°56’43.63’’E, in evergreen forests, 25 November 2014, Toyama H., Tagane S., Dang V.S., Nagamasu H., Naiki A., Tran H., Yang C.J. with Hieu H.N.P. V2167 ( FU, VNM, the herbarium of Iriomote Station ( Japan)); in the same location, 1502 m elev., 12°07’08.12’’N, 108°56’30.03’’E, in evergreen forests, 15 June 2019, Dang V.S., Dang 348 ( VNM) GoogleMaps .

Distribution: —Endemic to Vietnam (known from the Bidoup Nui Ba National Park in Lam Dong Province and the Hon Ba Nature Reserve in Khanh Hoa Province).

Habitat & Ecology: —Moist evergreen forest at around 1400–1600 m elev.

Phenology: —Flowering and fruiting from February to November.

Vernacular name: —Xú hưƠng hoàng nghĩa sƠn.

Notes: — Lasianthus nghiasonii is similar to L. inodorus Blume (1826: 998) in the shape of leaves, number of secondary veins, and inflorescence type, but differs from the latter in having longer petioles ( 10–15 mm long vs. 6–10 mm long), bracts 1–2 mm long (vs. 3–6 mm long) and larger calyx tubes ( 3–4 mm long vs. 2 mm long) and fruit color when ripe.