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

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scientific name

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

 

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).

Jack, W. (1823) Account of the Lansium and some other genera of Malayan plants. Transactions of the Linnean Society of London 14: 125 - 126.

Merrill, E. D. (1952) William Jack's genera and species of Malaysian plants. Journal of the Arnold Arboretum 33: 199 - 251.

Gallery Image

FIGURE 51. Lasianthus hirsutus (Roxb.) Merr. (A–C from Dang 184 and D–I from Dang 353, VNM and the herbarium of Iriomote Station (Japan)): A. Branch with flower buds, B. Stipules, C. Abaxial leaf surfaces, D–F. Inflorescence showing side view bracts, buds and flowers, G. young fruit, H–I. Mature fruits.

Gallery Image

FIGURE 52. Distribution maps of Lasianthus hirsutus, L. hispidulus, L. honbaensis and L. hongiaoensis.

VNM

Institute of Tropical Biology

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Gentianales

Family

Rubiaceae

Genus

Lasianthus