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| Petrocodon liboensis Sheng H.Tang & Jia W.Yang, in Tang, Ou, Ren et Yang, 2024. 荔波石山苣苔 || DOI: 10.3897/phytokeys.243.125716 |
Abstract
Petrocodon liboensis Sheng H.Tang & Jia W.Yang is a new species of Gesneriaceae from Guizhou, southwestern China. The new taxon has a pale-yellow corolla and is most similar to P. luteoflorus. However, it differs from the latter by having a urceolate (vs. cannulate) corolla tube, an abaxial corolla lip 0.8–1.1 mm (vs. 2–2.2 mm) long, and filaments 1.5–1.7 mm (vs. ca. 7 mm) long that are straight (vs. S-shaped or geniculate near the middle). The new taxon is assessed as “Data Deficient” (DD) according to the IUCN standards.
Key words: Didymocarpoideae, flora of China, Guizhou, karst flora, new taxon
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| Petrocodon liboensis A habitat B, C flowering plant D adaxial and abaxial surfaces of leaf blade E cymes, and bracts (inset) F flower in front view G flower in side view H, I opened corolla J stamens, and anthers (inset) K pistil, and cross section of ovary (inset) L capsules, and seeds (inset) (Photographs by Sheng-Hu Tang). |
Petrocodon liboensis Sheng H.Tang & Jia W.Yang, sp. nov.
Diagnosis: The new taxon has a nearly actinomorphic corolla and one nearly globose stigma. This combination of characters is shared by eight species and one variety of Petrocodon. The new taxon closely resembles P. luteoflorus (Fig. 2) in its pale-yellow corolla, two stamens, and divaricate thecae. However, it can be easily distinguished from the latter by the leaf blade being lanceolate or oblong (vs. narrowly elliptic or oblanceolate), lateral veins 2–3 (vs. 4–6) on each side of midrib, calyx segments 2.1–3.7 × 0.5–0.6 mm (vs. 6–8 × 1.5–2 mm) with entire (vs. entire to denticulate) margin, urceolate (vs. cannulate) corolla tube, abaxial corolla lip 0.8–1.1 mm (vs. 2–2.2 mm) long, and filaments 1.5–1.7 mm (vs. ca. 7 mm) long and straight (vs. S-shaped or geniculate near middle).
Etymology: The new taxon was named after its locality in Libo County, China.
Vernacular name: The Chinese name is “Lì Bō Shí Shān Jù Tái” (荔波石山苣苔).
Sheng-Hu Tang, Ming-Zhu Ou, Qi-Fei Ren and Jia-Wen Yang. 2024. Petrocodon liboensis (Gesneriaceae), A New Species from Guizhou, China. PhytoKeys. 243: 1-8. DOI: 10.3897/phytokeys.243.125716
