Note

Jasminum L. is one of the largest genera of Oleaceae, with over 200 species and has great diversity in tropical and subtropical regions of Southeast Asia, Europe, Australia and Africa (Mabberley 2008). The genus Jasminum in Vietnam has taxonomically been studied by several authors (Kobuski 1939; Pham 2003; Tran 2003; Bui et al. 2013, 2014). Bui et al. (2013, 2014) recognized 35 species of Jasminum in Vietnam. Among the 35 species of Jasminum, five species are newly recorded to the flora of Vietnam.

While exploring the flora of Vietnam during 2014–2016, the authors collected several specimens of Jasminum, of which two specimens were found interesting (Image 1). After having examined the specimens and consulting the relevant literature (Gagnepain 1933; Chang et al. 1996; Pham 2000; Nguyen 2003; Tran 2003), we found most of its vegetative structure and reproductive parts have much similarity to the typical varieties, J. hongshuihoense Jien ex B.M. Miao and J. laurifolium var. brachylobum Kurz, hitherto unreported from Vietnam (Images 2, 3), (Table 1 & 2). Hence, we report these taxa as a new distribution record to the flora of Vietnam.

 

 

 

 

Jasminum hongshuihoense Jien ex B.M. Miao

(Images 2 & 4)

in Fl. Reipubl. Popularis Sin. 61: 217. 1992. Chang et al., Fl. China 15: 315, 1996. J. tomentosum, S.Y. Bao ex P.Y. Bai, Acta. Bot. Yunnan. 5. 67. F.3. 1983.

Type: China. (holotype: KUN, photo! Barcode 120797448), 09.vi.1964. coll. S.Z. Wang 851.

Scandent shrubs, woody, up to 2–3 m long. Branchlets terete, innovations pubescent. Leaves opposite, simple, usually twisted, pubescent; leaf blade elliptic to lanceolate, rarely obovate, 4.5–19 × 2–7 cm, papery, glabrous adaxially, sparsely pubescent midrib on abaxial surface, pubescent to glabrescent abaxially, often tufted hairy in vein axils abaxially; base cuneate, blunt, or subcordate, apex acute to acuminate, rarely blunt; primary veins 4–10 on each side of midrib. Inflorescence simple, terminal or sometimes axillary, glabrous, cymose with 1–5 flowers, peduncle, 1–2 cm, glabrous or pubescent; bracts linear, 2–6 mm long, pubescent. Pedicel 1–2 cm long, pubescent. Calyx campanulate, dark green, pubescent; tube 1–2 x 0.5–1 mm wide; lobes 5–8, lobes teeth 4–5 mm long, pubescent. Corolla white, salver–form, glabrous, tube slender, 1–1.5 x ca. 0.15 cm wide, pale white, 6–8-lobed, white, 5–1.5 × 0.2–0.3 cm, apex acute. Stamens 2; filaments, ca. 1mm long, glabrous. Anthers 1.5–2 mm long, with acute connective appendage ca. 0.3mm. Ovary barrel-shaped, 0.2–0.5 mm, glabrous; style 0.8–1 cm long, glabrous; stigma narrowly oblong, ca. 3mm long, glabrous; ovules 2. Fruits greenish, sub-globose, 2–2.5 × 0.9–1.5 cm.

Specimen examined: Quang 89 (HN!), 19056’23.4”N & 105001’36.9”E, Quan Hoa, Thuong Xuan District, Thanh Hoa Province, Vietnam, coll. B.H. Quang.

Distribution: China (Guangxi, Guizhou, Yunnan), Vietnam (Quan Hoa, Thuong Xuan, Thanh Hoa).

Habitat: J. hongshuihoense was found growing on small hillocks in the open secondary sub-tropical forest areas in Quan Hoa, between 300–1000 m, associated with Antidesma sp., Embelia sp., Eurycoma sp., Miliusa sp., Dendrocnide sp., Tabernaemontana bufalina Lour., Licuala robinsoniana Becc. and Syzygium sp.

Phenology: The plants were flowering and fruiting between April and October.

Jasminum laurifolium var. brachylobum Kurz

(Images 3 & 5)

in Forest Fl. Burma. 2: 152. 1877. Chang et al., Fl. China 15: 315, 1996. J. laurifolium var. sublinearis C.B. Clarke, Fl. Brit. India 3: 597, 1882.

Type: Myanmar. 1838. coll. Helter, 3710 (holotype: K, photo! Barcode K000545663).

Scandent shrubs, 1–5 m. Branchlets terete, innovations glabrous. Leaves opposite, simple; leaf blade linear to narrowly elliptic or narrowly ovate, 5–12.5 × 0.7–3.3 cm, leathery, primary veins 3 on each side of midrib; petiole 4–12 mm, articulate near base, base cuneate or rounded, apex acuminate to caudate, rarely obtuse or acute. Inflorescence simple, terminal or sometimes axillary, glabrous, cymose, 1–8(10) flowers, peduncle ca. 2–3 cm; bracts linear, 3–5 mm long, glabrous. Pedicel 1–2 cm long, glabrous. Calyx campanulate, dark green, glabrous; tube 2–4 mm x 0.5–1 mm wide; lobes 6–10(12), lobes teeth 2–4(6) mm long, glabrous. Corolla white, salver-form, glabrous, tube slender, 2–3 x ca. 0.15 cm wide, pale white, 8–12 lobed, white, lanceolate or linear–lanceolate, 0.5–1.5 × 2.2–3 cm, apex acute. Stamens 2; filaments, 0.5–1mm long, glabrous. Anthers 1.5–3 mm long, with an acute connective appendage, ca. 0.2mm. Ovary barrel-shaped, 0.2–0.5 mm, glabrous; style, 1–2.2 cm long, glabrous; stigma narrowly oblong, ca. 6mm long, glabrous; ovules 2. Fruits, greenish, oblong–ovoid, 0.9–2.5 × 4–10 mm.

Specimens examined: 14814 (HN!), N.T. Nhan, 40 (HN!), B.H. Quang, Quan Hoa, Thuong Xuan District, Thanh Hoa Province, Vietnam.

Distribution: China (Guangxi, Hainan, Xizang, Yunnan), India, Myanmar, Vietnam (Thai Nguyên, Hoa Binh, Hai Duong, Thanh Hoa).

Habitat: Jasminum laurifolium var. brachylobum occur in Pu Hu Nature Reserve, Quan Hoa District, Thanh Hoa Province, between 300–600 m altitude.

Phenology: The plants were flowering and fruiting between May and December.

So far, J. hongshuihoense has been recorded from a single site in Vietnam. The area of occupancy (AOO) estimated is less than 20km2 and the number of matured individuals are 5–10. Moreover, this species has the limitation of a typical habitat characterized by primary forest, a steep shady slope, highly humid, nearby a waterfall, at a certain elevation (ca. 100m). More extensive field surveys are needed to find more populations of both Jasminum taxa reported here. They may probably exist somewhere in similar habitats in the study area. This work will provide insight into conservation and management of threatened plant species in Vietnam.

 

 

 

References

Bui, H.Q., T.T. Bach, R.K. Choudhary, V.T. Chinh, D.V. Hai, S.H. Park & J. Lee (2013). Jasminum extensum Wall. ex G. Don (Oleaceace), a new record to the Flora of Vietnam. Taiwania 58(2): 128–131.

Bui, H.Q., T.T. Bach, R.K Choudhary, C. Lee & J. Lee (2013). Jasminum attenuatum Roxb. ex G. Don (Oleaceae), a new record to the flora of Vietnam. Korean Journal of Plant Taxonomy 43(4): 263–266.

Bui, H.Q., R.K. Choudhary, T.T. Bach, V. T.Chinh, N.S. Khang, C. Lee & J. Lee (2014). Jasminum albicalyx Kobuski (Oleaceae), a new record from Vietnam. Korean Journal of Plant Taxonomy 44 (3): 178–180.

Chang, M.C., L.-C. Chiu, Z. Wei & P.S. Green (1996). Oleaceae, pp. 307–319. In: Wu, Z.Y. & P.H. Raven (eds.). Flora of China. Science Press (Beijing), China and Missouri Botanical Garden Press (USA).

Gagnepain, F. (1933). Oleaceae, 3: pp. 1034–1059. In: Lecomte, H. (ed.). Flore Générale de L’Indochine. Paris.

Green, P.S. (2000). Oleaceae, pp. 271–340. In: Santisuk, T. & Larsen, K. (eds.). Flora of Thailand. The Forest Herbarium, Royal Forest Department, Bangkok.

Green, P.S. (2003). Synopsis of the Oleaceae from the Indian sub-continent. Kew Bulletin 58(2): 257–295.

Kobuski, C.E. (1939). New and noteworthy species of Asiatic Jasminum. Journal of the Arnold Arboretum 20: 64.

Mabberley, D.J. (2008). Mabberley’s Plant-Book: A Portable Dictionary of Plants, their Classification and Uses. Cambridge University Press, England.

Miao (1992). Oleaceae. 61(2): 1–209. In: Flora Reipublicae Populairis Sinicae. Science Press, Beijing.

Pham, H.H. (2003). An Illustrated Flora of Vietnam Vol. 2. Ho Chi Minh Young Publishing House, Hanoi, 891–890pp.

Tran, D.L. (2003). Oleaceae, 2, pp. 1162–1166. In: Nguyen, T.B. (ed.). Checklist of Plant Species of Vietnam. Agricultural Publishing House, Hanoi.