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| Deinostigma fasciculatum W.H.Chen & Y.M.Shui in Shui, Wu, Yu, ... et Chen, 2020. |
Abstract
A new species of Deinostigma (Gesneriaceae) from Yunnan, China, Deinostigma fasciculatum W.H.Chen & Y.M.Shui, sp. nov., has been discovered and described. In the genus, the new species is similar to D. cicatricosum (W.T. Wang) D.J. Middleton & Mich. Möller and D. cyrtocarpum (D. Fang & L. Zeng) Mich. Möller & H.J. Atkins in dark purple flowers and falcate fruit, but differs from them mainly in the inflorescences with fasciculate flowers, calyx lobes (reflexed, narrowly lanceolate and 1.2–1.3 cm long), corolla tubes (sharply contracted below middle and white outside and below throat). The above three species grow nearby non-limestone wet cliffs and geographically isolated with different distributions (the new species in Southeast Yunnan, D. cicatricosum in Eastern Guangxi and D. cyrtocarpum in Southern Guangxi and Guangdong, China).
Keywords: Deinostigma cicatricosum, Deinostigma cyrtocarpum, new species, Sino-Vietnamese border, Yunnan
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| Figure 1. The distribution of Deinostigma fasciculatum W.H.Chen & Y.M.Shui, sp. nov. (■), with D. cicatricosum (W.T.Wang) D.J.Middleton & Mich.Möller (●) and D. cyrtocarpum (D.Fang & L.Zeng) Mich.Möller & H.J.Atkins (▲). |
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| Figure 2. Deinostigma fasciculatum W.H.Chen & Y.M.Shui, sp. nov. A habit B mature fruits C frontal view of flower D leaf abaxial side E top and back view of flowers F top view of opened corolla showing the interior surface of corolla tube, stamens and staminodes G pistil and calyx, arrow showing the calyx H ovary, calyx and bract. (b = bract, c = calyx, d = disc). |
Deinostigma fasciculatum W.H.Chen & Y.M.Shui, sp. nov.
Diagnosis: The new species is similar to D. cicatricosum and D. cyrtocarpum in dark purple flowers and falcate fruit, but differs from the latter two species in the inflorescences with fasciculate flowers (vs. with remote flowers), calyx lobes reflexed (vs. compacted), corolla tubes white outside and below throat (vs. purple) (Figs 2C, 3). The new species differs from D. cicatricosum in calyx lobes narrowly lanceolate (vs. narrowly oblong) and 1.2–1.3 cm long (vs. 0.8–1.0 cm), corolla tube sharply contracted below middle (vs. slightly contracted), capsule narrowly oblong (vs. linear) 2–2.5 cm long (vs. 3–4 cm long). It differs from D. cyrtocarpum in calyx lobes 1.2–1.3 cm long (vs. 0.5–0.8 cm long), corolla tube sharply contracted (vs. gradually contracted).
Etymology: The name refers to the flowers, which are fasciculate on inflorescences of the new species.
Vernacular name: Cù Huā Qí Zhù Jù Tái (Chinese pronunciation); 簇花奇柱苣苔 (Chinese name).
Distribution and habitat: The new species only grows on the wet cliff in the valley and only occurs at the type locality, Jinping County, Yunnan province, China.
Yu-Min Shui, Jian-Yong Wu, Zhi-Yong Yu, Shi-Wei Guo, Li Chen, Fang Wen and Wen-Hong Chen. 2020. Deinostigma fasciculatum, A New Species of Gesneriaceae in Yunnan, China. In: Shui Y-M, Chen W-H, Ren M-X, Wen F, Hong X, Qiu Z-J, Wei Y-G, Kang M (Eds) Taxonomy of Gesneriaceae in China and Vietnam. PhytoKeys. 157: 199-206. DOI: 10.3897/phytokeys.157.32683
