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| Stixis yingjiangensis J. Y. Shen in Shen, Ma, Gong, ... et Shi, 2021. |
Abstract
Stixis yingjiangensis (Resedaceae), a new species from Yingjiang, Yunnan, China, is described and illustrated. It is compared with two morphologically similar species S. philippinensis, and S. villiflora. It differs from the two species by both surfaces with sparsely strigillose on lateral nerves, midrib and pustules (each pustule is formed by a multicellular cushion from which one short hair can also be produced), inflorescences axillary, racemes, 3–9 cm, filaments lower third pubescent, upper two thirds glabrous, androgynophores 2–3 mm, glabrous except apex sparsely puberulent, gynophores with densely white hairs, ovary glabrous. A complete morphological description of Stixis yingjiangensis is provided, together with photographs, a conservation assessment, and a diagnostic key to 4 species and 1 subspecies of Stixis from China.
Keyword: China, new species, Resedaceae, Stixis philippinensis, Stixis yingjiangensis, Stixis villiflora, Yunnan
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| Holotype of Stixis yingjiangensis J. Y. Shen. |
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| Stixis yingjiangensis J. Y. Shen. A. Flowering branch. B. Flower with corolla opened showing staminal column and nectary. C. Flower remove sepals and stamens to show androgynophore, gynophore and pistil. D. Stamen. E. Adaxial leaf surface. F. Longitudinal section of the ovary. G. Cross section of the ovary. (Drawn by Jian-Yong Shen) |
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| Stixis yingjiangensis J. Y. Shen. A. Habitat. B. stem. C-E. Flowers from different periods. F. Flower dissection (remove sepals and filaments) to show androgynophore, gynophore, pistil. G. hairs on the top of androgynophore and base of filaments. H. Ovary opened longitudinally showing the ovules. I-J. Adaxial and abaxial leaf surface. K. Adaxial leaf surface to show the pustules. L. Adaxial leaf surface to show hairs (red arrows) on the pustules (Photo by Jian-Yong Shen). |
Stixis yingjiangensis J. Y. Shen sp. nov.
盈江斑果藤
Diagnosis: In terms of morphology, Stixis yingjiangensis exhibits morphology similar to S. philippinensis (Turcz.) Merr. and S. villiflora J.Y. Shen, S. Landrein, W.G. Wang & X.D. Ma, both of which calyx are reflexed at anthesis and with long gynophores (longer than 6 mm), but can be distinguished from them by several characters (See Table 1). S. yingjiangensis both leaf surfaces with sparsely strigillose on lateral nerves, midrib and pustules (each pustule is formed by a multicellular cushion from which one short hair can also be produced), while in S. philippinensis both surfaces glabrous except for a few pustules (without any hairs on it) above near the base of the midrib, and in S. villiflora both surfaces pubescent and pustulate (each pustule is formed by a multicellular cushion from which one to several hairs can also be produced), inflorescences axillary, racemes, 3–9 cm (vs. terminal, panicle, up to 25 cm long in S. philippinensis, axillary or terminal, racemes, 5–12 cm in S. villiflora), stamens 15–22, filaments lower third pubescent, upper two thirds glabrous (vs. 35–40(– 48), filaments glabrous in S. philippinensis, 14–18, filaments lower half pubescent, upper half sparsely pubescent or glabrous in S. villiflora), androgynophore 2– 4 mm, glabrous except apex sparsely puberulent (vs. 2–3 mm glabrous in S. philippinensis, ca. 1mm, lower half glabrous, upper half tomentose in S. villiflora), ovary glabrous (vs. glabrous in S. philippinensis, densely white hairs in S. villiflora).
Etymology: The specific epithet is derived from the type locality, Yingjiang County, Dehong Dai and Jingpo Autonomous Prefecture, Yunnan, China.
Jian-Yong Shen, Xing-Da Ma, Qiang-Bang Gong, Guo-Hui Huang, Xue-Lian Yang and Ji-Pu Shi. 2021. Stixis yingjiangensis, A New Species of Resedaceae from Yunnan, China. Taiwania. 66(3); 326-331. DOI: 10.6165/tai.2021.66.326
