A new species and record for the genus Begonia (Begoniaceae) from Vietnam

Thanh Son HOANG ； Che-Wei LIN ； Anh Tai VU

《TAIWANIA》 66卷3期 (2021/09) Pp. 317-325

https://doi.org/10.6165/tai.2021.66.317

摘要

A new species and record of Begonia L. from the central highlands is described and illustrated. The new species, B. mangdenensis is assignable to Begonia sect. Platycentrum based on the axillary inflorescence, 4-tepaled staminate flower and 5- tepaled pistillate flower with ovary two locules each with two placentas. B. mangdenensis is most similar to B. lamdongiana, but it is different in its variegated (vs. uniformly green) and velvetly (vs. slightly waxy) upper surface of lamina, villous (vs. glabrous) peduncle, first pair of bracts glabrous (vs. puberulous or hirsute) in abaxial surface, bracts margin entire and ciliate (vs. denticulate or laciniate to biserrate, ciliate). In addition, B. yui Irmsch., previously known from China, is newly recorded from Vietnam.

關鍵字

Begonia mangdenensis ； Begonia lamdongiana ； Begonia yui ； endemism ； Platycentrum ； Tubibracteolea

參考文獻

Hai, D.V., D.Z. Min, N.S. Khang, Y.H. Tan, P.T.K. Thoa, G.L.C. Bramley, R.P.J. De Kok and B. Li. 2018. Premna vietnamensis (Lamiaceae, Premnoideae), a distinct new species from the Central Highlands of Vietnam. PLOS ONE 13(5): e0195811.

Hareesh, V.S., T.A. Le and T.T.D. Pham. 2019. Billolivia thongii (Gesneriaceae), a new species from Central Highlands, Vietnam. Webbia 74(2): 293–296.

Hoang, T.S. and C.W. Lin. 2021. Two new species of Begonia (sect. Platycentrum, Begoniaceae) from the Central Highlands of Vietnam: B. villosula and B. lophura. Phytotaxa 510(3): 263–274.

Lin, C.W., T.C. Hsu, H.T. Luu, I.L.P.T. Nguyen, T.Y.A. Yang and C.W. Li. 2021a. Revision of Begonia (Begoniaceae) in Bidoup-Nui Ba National Park, Southern Vietnam, including two new species. Phytotaxa 496(1): 077–089.

Lin, C.W., L.C.S. Phan and N.H. Nguyen. 2021b. Begonia rigidifolia ssp. sonhungii (sect. Petermannia, Begoniaceae), a new subspecies from limestone hills in Central Vietnam. Phytotaxa 498(2): 139–144.