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| Rehderodendron truongsonense P.W. Fritsch, W.B. Liao, & W.Y. Zhao, in Zhao, Fritsch, Do, Fan, Yin, Penneys, Swenson et Liao, 2019. |
Rehderodendron truongsonense, a new species from Vietnam, is described and illustrated. In the treatment of the Styracaceae for the Flore du Cambodge, du Laos, et du Viêtnam, specimens of this species were recognized as R. macrocarpum Hu. These specimens clearly differ from R. macrocarpum, however, as well as from all other species of Rehderodendron (where these characters are known) by, e.g., an evergreen versus deciduous habit, fewer secondary veins of the leaf blade, shorter inflorescences and corolla lobes, large and conspicuous lowermost bracteoles, the presence of eight ovules per carpel, and a fruit with ca. 10 to 20 ribs that are indistinct. Phylogenetic analysis based on five chloroplast DNA regions (clpP-psbB, ndhD-psaC-ndhE-ndhG, rpl22-rps19, rps18-rpl20, and psbI-trnS-GCU) placed the new species as nested within Rehderodendron and sister to R. gongshanense. This new species is endemic to the Truong Son Mountain Range, from which the epithet is derived, and we assign it an IUCN Red List preliminary status as Near Threatened.
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| Images of living Rehderodendron truongsonense: reproductive characters. A. Inflorescences showing bud scales, prophylls, bracteoles, and flowers in bud and at anthesis. B. Inflorescences showing flowers in bud and at anthesis showing stamens and styles. C. Branchlet with immature fruit. D. Branchlet with nearly mature fruit. Note indistinct ribs. E. Fruit cut transversely near middle showing three locules with one seed each. F. Old fruit showing endocarp tissue with radiating rays and two locules separated by a central canal. A, B, U. Swenson et al. 2131; photographs by U. Swenson. C, F, Q. Fan et al. 17322; photographs by Q. Fan. D, E, Swenson et al. 2018; photographs by V.T. Do. |
Rehderodendron truongsonense P.W. Fritsch, W.B. Liao, & W.Y. Zhao, sp. nov.
Wan-Yi Zhao, Peter W. Fritsch, Van Truong Do, Qiang Fan, Qian-Yi Yin, Darin S. Penneys, Ulf Swenson, Wen-Bo Liao. 2019. Rehderodendron truongsonense (STYRACACEAE), A New Species from Vietnam. J. Bot. Res. Inst. Texas. 13(1); 157 – 171. DOI: doi.org/10.17348/jbrit.v13.i1.837
