Lasianthus lucidus Blume (1826: 997)

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
persistent identifier	https://treatment.plazi.org/id/43284262-FFFD-FFBA-5AB6-F83345A5CEC4
treatment provided by	Plazi
scientific name	Lasianthus lucidus Blume (1826: 997)
status

Treatment

47. Lasianthus lucidus Blume (1826: 997) View in CoL View at ENA — Fig. 74 View FIGURE 74 (plate), Fig. 73 View FIGURE 73 (map)

Type: — INDONESIA. Java, Blume s.n. (lectotype L! [L0000697], designated by Zhu 2002) .

Mephitidia lucida DC. (1830: 453) . Type: — INDONESIA. Java, Blume s.n. (lectotype L! [L0000697], designated by Zhu 2002).

Specimens examined: — VIETNAM. Northern: Ninh Binh Province, 21 August 1889, Bon 4214 ( HN, P) . Central: Thua Thien Hue Province, Bach Ma National Park, 1193 m elev., 26 July 2019, Dang V.S. & Naiki A., Dang 405 & Dang 416 ( VNM, the herbarium of Iriomote Station (Japan)); Da Nang City, Ba Na Nature Reserve , 1489 m elev., 27 July 2019, Dang V.S. & Naiki A., Dang 423 ( VNM, the herbarium of Iriomote Station (Japan )) .

Distribution: —Widespread in tropical and subtropical regions in Asia ( Bangladesh, China, India, Indonesia, Malaysia, Myanmar, New Guinea, Philippines, Thailand). In Vietnam, Lasianthus lucidus occurs in Da Nang, Ha Nam, Nam Dinh, Ninh Binh and Thua Thien Hue.

Habitat & Ecology: —Growing in the shade of evergreen forest or the hill of the natural forest at 700–1500 m elev. The species was collected from the understory of a forest dominated by Lasianthus japonicus Miq. (1867: 110) , L. fordii Hance (1885: 324) , Phyllanthus sp. , Croton persimilis Müll.Arg. (1865: 116) , Streblus asper Lour. (1790: 615) , Litsea globosa Kosterm. (1970: 99) , Markhamia stipulata Seem. (1863: 226) , Cinnamomum balansae Lecomte (1913: 75) .

Phenology: —Flowering and fruiting from July to January of the next year.

Vernacular name: —Xú hưƠng suốt.

Notes: — Lasianthus lucidus is easily identified in the field in having ovate to ovate-elliptic leaves, secondary veins 3–5 on each side of midrib, calyx widely campanulate and lobes 5, and fruits globose to ovoid, blue when ripe. Lasianthus lucidus is similar to L. fordii Hance (1885: 324) but differs by having smaller leaves (4–9 × 1.5–3 cm vs. 6–10 × 3–5 cm), leaf blade membranaceous (vs. chartaceous) and calyx lobes longer (vs. shorter) than calyx tube.