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| Hydrangea medogensis X.Z.Lan, W.L.Zheng & W.Q.He, in He, Zheng, F.-Y. Zhao, Yin, Li, K.-H. Zhao, Zhang, Liao et Lan, 2026. 墨脱绣球 | DOI: doi.org/10.3897/phytokeys.279.203326 |
Abstract
Based on field surveys, examination of herbarium specimens, and molecular phylogenetic analyses, the present study described a new species, Hydrangea medogensis sp. nov. (Hydrangeaceae), from Medog County, Xizang Autonomous Region, China. Phylogenetic analyses indicated that H. medogensis was placed in Clade 1 as a distinct lineage, sister to the remainder of the clade. Morphologically, the new species is most similar to H. stylosa but can be distinguished by the following key characteristics: fertile flowers with a globose calyx tube constricted at the mouth; calyx teeth triangular, occasionally oblong-ovate, 0.6–1 mm long; adaxial leaf surface covered with two types of soft hairs (long and short); ovary more than 4/5 inferior, nearly completely inferior; and seeds with a very narrow wing around the margin. The taxonomic status of the new species was established based on integrated morphological and molecular evidence.
Key words: Hydrangea, morphological analysis, new species, phylogenetic analysis
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| Hydrangea medogensis X.Z.Lan, W.L.Zheng & W.Q.He. A. Habitat; B. Flowering branch; C. Sterile flowers and young fruits; D. Branchlet; E. Fruiting branch. |
Hydrangea medogensis X.Z.Lan, W.L.Zheng & W.Q.He, sp. nov.
Diagnosis. Hydrangea medogensis is morphologically similar to H. stylosa, but differs in having ovaries more than 4/5 inferior (vs. ca. 2/3 inferior), leaves with adaxial surface covered with long and short hairs (vs. nearly glabrous or glabrous on both surfaces), fertile flowers with calyx tube subglobose, calyx opening constricted, calyx teeth triangular, occasionally oblong-ovate, 0.6–1 mm long (vs. calyx tube campanulate, calyx opening tubular, calyx teeth ovate or suboblong, 1–1.5 mm long), and seeds narrowly winged around margin (vs. minutely winged at one or both ends).
Etymology. The epithet indicates the type locality, i.e., Medog area, Xizang, China.
Vernacular name. mò tuō xiù qiú (Chinese pronunciation);
墨脱绣球 (Chinese name).
Wen-Qi He, Wei-Lie Zheng, Fang-Yu Zhao, Kai-Xin Yin, Lian-Qiang Li, Kai-Hui Zhao, Fang-yuan Zhang, Zhi-hua Liao and Xiao-Zhong Lan. 2026. Hydrangea medogensis (Hydrangeaceae), A New Species from Xizang (Tibet), China. PhytoKeys. 279: 51-68. DOI: doi.org/10.3897/phytokeys.279.203326 [10 Sep 2026]












































