Lasianthus hirsutus (Roxb.) Merr. (1952: 229)

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.7571700
persistent identifier	https://treatment.plazi.org/id/43284262-FFDB-FF96-5AB6-FA0B41DACDD8
treatment provided by	Plazi
scientific name	Lasianthus hirsutus (Roxb.) Merr. (1952: 229)
status

Treatment

29. Lasianthus hirsutus (Roxb.) Merr. (1952: 229) View in CoL View at ENA — Fig. 51 View FIGURE 51 (plate), Fig. 52 View FIGURE 52 (map)

Type: — BANGLADESH. Chittagong, sp.no. 139 (lectotype BM! [ BM000848507 ], designated by Merrill 1952) .

Triosteum hirsutum Roxb. (1824: 180) . Type : — BANGLADESH. Chittagong, sp.no. 139 (lectotype BM! [ BM000848507 ], designated by Merrill 1952).

Lasianthus cyanocarpus Jack (1823: 125) var. asperatus Pierre ex Pit. (1924: 381) View in CoL . Type:— VIETNAM. Dong Nai Province, Bien Hoa District, Pierre 3256 (syntype L! [L0305709]).

Lasianthus cyanocarpus var. lucidulus Pierre ex Pit. (1924: 382) View in CoL . Type:— VIETNAM. Dong Nai Province, Bien Hoa District , September 1869, Pierre s.n. (syntype L! [L0310260]).

Specimens examined: — VIETNAM. Central: Ninh Thuan Province, Thuan Nam District, Ca Na, 12 November 1923, Poilane 8608 ( VNM); Khanh Hoa Province, Hon Ba Nature Reserve , 1000 m elev., 19 April 2018, Dang V.S. & Hoang N.T.B.N., Dang 184 ( VNM, the herbarium of Iriomote Station (Japan)); in the same location, 1502 m elev., 15 June 2019, Dang V.S. & Hoang N.T.B.N., Dang 353 ( VNM) . Southern: Dong Nai Province, Bien Hoa District, September 1865, Pierre 3256a ( VNM); in the same location, Xuan Loc District , Nui Chua Chan , 650 m elev., 07 October 1930, Poilane 19479 (P) .

Distribution: —Widespread in tropical and subtropical regions in Asia ( Bangladesh, Cambodia, China, Japan, India, Indonesia, Laos, Malaysia, Myanmar, Papua New Guinea, Philippines, Thailand). In Vietnam, Lasianthus hirsutus occurs in Dong Nai, Khanh Hoa, Kien Giang, Lam Dong, Ninh Binh, Ninh Thuan, and Thua Thien Hue.

Habitat & Ecology: —Growing under the shade of the primary or secondary montane forest, sometimes on the edge of the forest, 300–1600 m elev.

Phenology: —Flowering and fruiting from September to April of the next year.

Vernacular name: —Xú hưƠng quả lam.

Notes: — Lasianthus hirsutus is easily recognizable in the field from other Lasianthus in having usually stiff spreading rusty-hirsute branches, oblong to oblong-lanceolate leaves, secondary veins 7–10 on each side of midrib, bracts very large and leaf-like, 2–3.5 cm long, hirsute on both surfaces, flowers white, fruits ovoid to globose, blue when ripe.

Lasianthus hirsutus is similar to L. cyanocarpus Jack (1823: 125) which was selected as the type of the genus Lasianthus based on its bracts, but differs from the latter in having larger leaves 12–20 × 4–6 cm (vs. 8–13.5 × 2.5–4.5 cm), longer petioles 10–15 mm long (vs. 2 mm long), calyx obconical with densely long hirsute (vs. campanulate with tomentose) and pyrenes 5 (vs. 4).