Fifteen New Species of Angiosperms from Bidoup-Nui Ba National Park, Southern Highlands of Vietnam

Shuichiro Tagane1,*, nguyen Van ngoc2, hoang Thi Binh2, ai nagahama3, meng Zhang3, Truong Quang cuong4, Le Van Son4, Van-Son Dang5, hironori Toyama6, naTSuki komaDa7, hiDeToShi nagamaSu8 anD TeTSukaZu yahara9

1The Kagoshima University Museum, Kagoshima University, 1-21-30 Korimoto, Kagoshima 890-0065, Japan. *stagane29@gmail.com (author for correspondence); 2Faculty of science, Dalat University, 01 Phu Dong Thien Vuong, Dalat City, Lam Dong, Vietnam; 3Graduate School of Systems Life Sciences, Kyushu University, Fukuoka 819-0395, Japan; 4Bidoup-Nui Ba National Park, Lam Dong, Vietnam; 5The VNM Herbarium, Institute of Tropical Biology, Vast, 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, Vietnam; 6Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan; 7Laboratory of Forest Resources and Society, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan; 8The Kyoto University Museum, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan; 9Kyushu Open University, Fukuoka 819-0395, Japan

Fifteen new species of angiosperms, Ilex bidoupensis, I. hongiaoensis (Aquifoliaceae), Mastixia hongiaoensis (Cornaceae), Daphniphyllum hongiaoense (Daphniphyllaceae), Platea hongiaoensis (Icacinaceae), Neolitsea bidoupensis, N. hongiaoensis (Lauraceae), Nyssa bidoupensis, N. hongiaoensis (Nyssaceae), Eriobotrya hongiaoensis, Prunus hongiaoensis (Rosaceae), Luvunga hongiaoensis (Ruta- ceae), Illicium viridiflorum (Schisandraceae), Symplocos hongiaoensis (Symplocaceae) and Alpinia hongiaoensis (Zingiberaceae), from the Hon Giao area in Bidoup-Nui Ba National Park, Lam Dong Province, in the southern highlands of Vietnam, are described and illustrated.

Keywords: Angiosperms, flora, Indochina, new species, taxonomy, Vietnam

Ilex bidoupensis Yahara & Tagane, sp. nov. — Fig. 2A–D.

Ilex hongiaoensis Tagane, sp. nov. —Fig. 2E–I.

Fig. 2. Ilex bidoupensis Yahara & Tagane (A–D). A: Flowering branch. B: Lower leaf surface. C: Leafy twig. D: Staminate inflorescence. Ilex hongiaoensis Tagane (E–I). E: Fruiting twig. F: Lower leaf surface. G: Fruit. H: Transverse section of fruit. I: Fruit pericarp removed showing pyrenes. Photographs A, B & D from Yahara et al. V9851 taken on 22 Apr. 2019; C from Yahara et al. V8650 taken on 18 June 2018; E–I from Tagane et al. V9412 taken on 1 Oct. 2019; all taken by Shu- ichiro Tagane. 

Mastixia hongiaoensis Tagane & Cuong, sp. nov. —Fig. 3. 

Fig. 3. Mastixia hongiaoensis Tagane & Cuong. A: Flowering branch. B: Lower leaf surface. C: Side view of inflorescence. D: Top view of inflorescences. E: Flower. F: Flowers after anthesis, corolla fallen. G: Portion of inflorescence showing calyx and bracteoles. H; Young fruit. I: Fruiting branch. J: Fruit. Photographs A–H from Tagane et al. V9610 taken on 22 Dec. 2018; I & J from Yahara et al. V9764 taken on 20 Apr. 2019; all taken by Shuichiro Tagane.

Daphniphyllum hongiaoense Yahara & Tagane, sp. nov. —Fig. 4.

Fig. 4. Daphniphyllum hongiaoense Yahara & Tagane. A: Branch with staminate inflorescences. B: Lower leaf surface. C: Branch with pistillate inflorescence. D: Branch with young fruits. E: Apex of branch. F: Portion of staminate inflorescence showing stamens. G: Portion of pistillate inflorescence. H: Young fruits with persistent bilobed stigma at apex. Photographs A, B, E & F from Yahara et al. V8669 taken on 19 June 2018; C & G from Yahara et al. V8550 taken on 17 June 2018; D & H from Tagane et al. V9340 on 24 Sept. 2018; A, B, D–F & H taken by Shuichiro Tagane; C & G taken by Ai Nagahama.

Platea hongiaoensis Tagane, sp. nov. —Fig. 5.

Fig. 5. Platea hongiaoensis Tagane. A: Fruiting branch. B: Current year ferruginous twigs (upper 2/3). C: Lower leaf surface. D: Fruit: E: 2-flowered pistillate inflorescence. F: Top view of fruit showing blackish persistent stigma. All photographs from Yahara et al. V9863 taken on 22 April 2019; all taken by Shuichiro Tagane.

Neolitsea bidoupensis Yahara & Tagane, sp. nov. —Fig. 6A–E. 

Neolitsea hongiaoensis Yahara & Tagane, sp. nov. —Fig. 6F–J. 

Fig. 6. Neolitsea bidoupensis Yahara & Tagane (A–E). A: Fruiting branch. B: Lower leaf surface. C: Staminate umbels. D: Sta- minate flower. E: Fruits. Neolitsea hongiaoensis Yahara & Tagane (F–J). F: Branch with pistillate flower. G: Young leaves. H; Portion of lower leaf surface. I & J: Pistillate flowers and buds. Photographs A, B & E from Yahara et al. V9420 taken on 1 Oct. 2018; C from Tagane et al. V4244 taken on 23 Feb. 2016; D from Tagane et al. V4505 taken on 27 Feb. 2016; F–J from Yahara et al. V9714 taken on 26 Dec. 2018; all taken by Shuichiro Tagane. 

Nyssa bidoupensis Tagane & Yahara, sp. nov. —Fig. 7. 

Fig. 7. Nyssa bidoupensis Tagane & Yahara. A: Fruiting branch. B: Flowering branch. C: Shoot apex showing terminal bud. D: Trunk. E: Lower leaf surface. F: Staminate inflorescence. G: Infructescence. Photographs A, C–E & G from Tagane et al. V9097 taken on 26 June 2018; B & F from Yahara et al. V10064 taken on 24 Apr. 2019; all taken by Shuichiro Tagane.

Nyssa hongiaoensis Tagane & Komada, sp. nov. —Fig. 8.

Fig. 8. Nyssa hongiaoensis Tagane & Komada. A: Flowering branch. B: Fruiting branch. C: Current year twigs. D: Young leaves. E: Lower leaf surface. F: Pistillate inflorescence. G: Young pistillate inflorescence with flower buds. H: Pistillate flowers. I: Infructescence. J Fruit and seeds (scale bar = 1 cm). Photographs A, D & F–H from Yahara et al. V9921 taken on 22 Apr. 2019; B & E from Tagane et al. V9416 taken on 1 Oct. 2018; C, I & J from Tagane et al. V9428 taken on 1 Oct. 2018; all taken by Shuichiro Tagane.

Eriobotrya hongiaoensis Yahara & Tagane, sp. nov. —Fig. 9. 

Fig. 9. Eriobotrya hongiaoensis Yahara & Tagane. A: Leafy branch. B: Shoot apex. C: Flowering branch. D: Portion of abax- ial leaf surface. E & F: Flowers. Photographs A & B from Yahara et al. V8593 taken on 18 June 2018; C–F from Yahara et al. V9864 taken on 22 Apr. 2019; all taken by Shuichiro Tagane.

Prunus hongiaoensis Tagane & Yahara, sp. nov. —Fig. 10.

Fig. 10. Prunus hongiaoensis Tagane & Yahara. A: Branch with flower buds. B: Portion of abaxial leaf surface showing basal glands. C: Fruiting branch. D: Trunk. E: Inflorescence. F: Infructescence. G. Stipules. H: Side view of flower and flower bud. I: Top view of flower. Photographs A from Tagane et al. V8583 taken on 17 June 2018; B, D, E & G–I from Tagane et al. V8691 taken on 19 June 2018; C & F from Yahara et al. V8540 taken on 24 Sept. 2019; all taken by Shuichiro Tagane.

Luvunga hongiaoensis Tagane, sp. nov.—Fig. 11. 

Fig. 11. Luvunga hongiaoensis Tagane. A: Flowering branch. B: Lower leaflet surface. C: Stem showing short recurved axil- lary spines. D & E: Flowers. F: Inflorescence showing side view of flower, and calyx and gynoecium. All photos from Tagane et al. V9609 taken on 22 Dec. 2019; all taken by Shuichiro Tagane.

Illicium viridiflorum Yahara, A. Nagah. & Tagane, sp. nov. —Fig. 12. 

Fig. 12. Illicium viridiflorum Yahara, A. Nagah. & Tagane. A: Leafy branch. B: Lower leaf surface. C: Flowers on the trunk. D: Flower in the axils of leaves. E: Bottom view of flower. F & G: Top view of flowers showing each has 10 and 14 stamens. H: Fruit. Photographs A–G from Yahara et al. V9875 taken on 22 Apr. 2019; H from Tagane et al. V9258 on 28 June 2018; A, B, D, F & H taken by Shuichiro Tagane; C, E & G by Ai Nagahama. 

Symplocos hongiaoensis Nagam. & Tagane, sp. nov. —Fig. 13. 

Fig. 13. Symplocos hongiaoensis Nagam. & Tagane. A: Branch with flower. B: Lower leaf surface, C: Solitary flower. D & E: Flower. F. Flower after anthesis, corolla and stamens dropped. G: Fruiting branch. H: Young fruit. Photographs A–F from Tagane et al. V9427 taken on 1 Oct 2018; G & H from Yahara et al. V9701 taken on 26 Dec. 2018; all taken by Shuichiro Tagane.

Alpinia hongiaoensis Tagane, sp. nov. —Fig. 14.

Fig. 14. Alpinia hongiaoensis Tagane. A: Habit. B: Ligule. C: Portion of lower leaf surface. D: Inflorescence with flower buds. E: Front view of flower. F: Side view of flower. All photographs from Yahara et al. V9886 taken on 22 April 2019; all tak- en by Shuichiro Tagane. 

Soure: Shuichiro Tagane, Nguyen Van Ngoc, Hoang Thi Binh, Ai Nagahama, Meng Zhang, Truong Quang Cuong, Le Van Son, Van-Son Dang, Hironori Toyama, Natsuki Komada, Hidetoshi Nagamasu, Tetsukazu Yahara; Fifteen New Species of Angiosperms from Bidoup-Nui BaNational Park, Southern Highlands of Vietnam; Acta Phytotaxonomica et Geobotanica; Volume 71 (2020) Issue 3