Jasminum lang Gagnep., Fl. Indo-Chine [Lecomte et al.]. 3: 1046 (1933a); Bull. Soc. Bot. France 80: 77 (1933b)

Quang, Bui Hong, Choudhary, Ritesh Kumar & Lee, Joongku, 2021, Nomenclatural notes and typification of nine names related to Jasminum (Oleaceae), PhytoKeys 183, pp. 55-65 : 55

5. Jasminum lang Gagnep., Fl. Indo-Chine [Lecomte et al.]. 3: 1046 (1933a); Bull. Soc. Bot. France 80: 77 (1933b)

Lectotype

(here designated):- Vietnam. Kiên Khê, in collib. Dong Bau, (Ha Nam Province), 31 March 1885, H.F. Bon 2869, P00640614 (P, image!); Isolectotype: K000901460 (K, image!).

Syntypes.

Vietnam. Kiên Khê, in collib. Dong Bau, (Ha Nam Province), 19 March 1884, H.F. Bon 2604, P00640615 (P, image!); Presqu’ile de Nui-han-heo (Hon Heo mountain, currently in Ninh Hoa Town, Khanh Hoa Province), 12 June 1933, Poilane 6867 (K, image!), VNM00021039 (VNM, image!).

Nomenclatural notes.

Jasminum lang was described ( Gagnepain 1933a, b) based on three gatherings (H.F. Bon 2604, 2869 and Poilane 6867) collected from north, and south Vietnam. We found two duplicates matching the detailed description and specimen label information. A survey of literature and multiple herbaria revealed that a lectotype for J. lang had not been designated in earlier studies ( Ho 2000; Tran 2003). We, therefore, selected the P specimen (P0040614) as a lectotype for Jasmnium lang following Arts. 9.3 and 9.11 of ICN ( Turland et al. 2018) as it represents the species best. The other specimen at K (K000901460) is designated here as isolectotype.

Taxonomic notes.

Jasminum lang is known from China and Vietnam ( Gagnepain 1933a, b; Chia 1952; Miao 1984; Chang et al. 1996; Ho 2000). During the course of our revisionary work, we critically compared the morphological characters of Jasminum lang with Jasminum coffeinum Hand.-Mazz. because of their morphological differences and their treatment as synonyms ( Chang et al. 1996; Green 2006). Our field observation and study of the multiple specimens housed in various national and international herbaria made us realize that the species are morphologically different. Indeed, the characters used for their delimitation ( Handel and Heinrich 1925; Gagnepain 1933a, b; Chia 1952; Miao 1984; Chang et al. 1996; Ho 2000), as indicated in Table 1 , clearly indicate that they are different entities. Therefore, we reinstate J. lang Gagnep., as a distinct species.

Ecology and phenology.

Grows in the forest at altitude 100-800 m.a.s.l. Flowering in February - April, fruiting May - June.

Distribution.

Vietnam. Endemic to Hoa Binh (Mai Chau), Ha Nam (Kien Khe), Quang Ninh (Ha Long bay), and Khanh Hoa (Hon Heo, Hon Ba Nature Reserve) Provinces.