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| Petrocosmea dejiangensis Sheng H.Tang & Jian Xu, in Xu, Li, Tang et Ren, 2022. |
Abstract
Southwestern China is the centre of diversity of Petrocosmea (Gesneriaceae). Here, a new species, named Petrocosmea dejiangensis, from north-eastern Guizhou, China, is described. The new species is most similar to P. martini, but it is distinguished from the latter by two dark blue-purple stripes inside the corolla tube along its entire length, the anthers shorter than the filaments, and the stigma apex rounded. Three populations comprising approximately 120 mature individuals were found at and near the type locality. This new taxon was assessed as “Data Deficient” (DD), according to IUCN standards.
Keywords: Didymocarpoideae, Flora of China, Petrocosmea martini
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| Petrocosmea dejiangensis Sheng H.Tang & Jian Xu, sp. nov. A habitat B flowering plant, rhizome, and fibrous roots (inset) C adaxial surface of leaf blade D abaxial surface of leaf blade E flower in front view F flower in side view G flower in top view H flower in back view I opened corolla showing stamen and pistil inside the corolla J opened corolla with stamens and pistil removed, showing stripes inside the corolla K stamens and anther (inset) L pistil and stigma (inset) M young fruit and calyx lobes. (Photographs by Sheng-Hu Tang and Jian Xu). |
Petrocosmea dejiangensis Sheng H.Tang & Jian Xu, sp. nov.
Petrocosmea dejiangensis has a highly fused upper lip. This important character is shared by 21 species of Petrocosmea. The new species is most similar to P. martini (Fig. 2) in the indumentum of the petiole, leaf blade, filaments, and ovary, but differs from it in having inconspicuous bracts (vs. conspicuous), two dark blue-purple stripes inside along the entire corolla tube (vs. two purple spots inside the tube under the filaments), throat blue-purple (vs. white), anthers shorter than filaments (vs. anthers subequal to filaments in length), and stigma apex rounded (vs. flat).
Etymology:—The new taxon is named after the type locality, Dejiang County, China.
The Chinese name is “Dé Jiāng Shí Hú Dié” (德江石蝴蝶).
Distribution and habitat:— Three populations with nearly 120 mature individuals were found at Nangan town, Dejiang County, Guizhou Province, China. The plants grew on moist shady rocks in valleys at an elevation of ca. 600–700 m. The main companion species were Platycarya strobilacea Siebold & Zuccarini (1843: 741–742), Lindera communis Hemsley (1891: 387), and Carpinus sp. Linnaeus (1753: 998) sp.
Jian Xu, Sa Li, Sheng-Hu Tand and Qi-Fei Ren. 2022. Petrocosmea dejiangensis (Gesneriaceae), A New Species from Guizhou, China. Phytotaxa. 539(1); 17-23. DOI: 10.11646/phytotaxa.539.1.2
