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| Petrocodon curvitubus J.X.Wei, B.Pan & T.Ding, in Wei, Pan et Ding, 2025. |
Abstract
A new species of Gesneriaceae, Petrocodon curvitubus J.X.Wei, B.Pan & T.Ding, sp. nov. from Guangxi, China, is described and illustrated. The new species is morphologically similar to P. lui and P. tenuitubus, but can be easily distinguished by its elliptic to oblong-ovate leaves, corollas with two purple longitudinal stripes, and conical ovary.
Key words: China, Gesneriaceae, Guangxi, limestone flora, new species
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| Petrocodon curvitubus J.X.Wei, B.Pan & T.Ding, sp. nov. A plant in flower B abaxial leaf surface and petiole C bracts D frontal view of corolla and side view of flower showing strongly curved corolla tube E longitudinal section of corolla showing the position of stamens F stamens with cohering anthers G pistil and calyx H pistil with sepals dissected I stigmas J fruit. |
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| Petrocodon curvitubus J.X.Wei, B.Pan & T.Ding, sp. nov. A habitat B plant in flower C adaxial leaf surface D abaxial leaf surface E frontal view of flower F opened corolla G side view of flower showing strongly curved corolla tube H pistil and calyx I sepals J stamens (st.) and staminodes (sta.) from a pickled specimen K pistil and calyx with partly dissected sepals from a pickled specimen. |
Petrocodon curvitubus J.X.Wei, B.Pan & T.Ding, sp. nov.
Diagnosis: P. curvitubus is florally similar to P. lui and P. tenuitubus. However, it can be distinguished from these by leaf characteristics, with leaves elliptic to oblong-ovate, apex obtuse or slightly acuminate, base cuneate (vs P. lui, ovate or broadly ovate; apex subacute or obtuse, base cordate to shallowly cordate, oblique; vs P. tenuitubus, ovate to orbicular; apex obtuse, base cordate symmetrical or asymmetrical), corollas with purple stripes (vs absent in P. lui and P. tenuitubus), corolla lobes obovate-elliptic to oblong, apex acuminate (vs P. lui, lobes oblong, obovate to suborbicular, apex obtuse; vs P. tenuitubus, lobes narrowly ovate to ovate, apex obtuse), and ovary conical, ca. 2.5 × ca. 0.8 mm (vs P. lui, linear, ca. 3 × 1.5 mm; vs P. tenuitubus, ovoid, 1–2 × 1–1.5 mm) (Table 1).
Etymology: The epithet originates from the strongly curved corolla tube.
Vernacular name: Wān Guǎn Shí Shān Jù Tái (弯管石山苣苔), the first two words, “Wān Guǎn,” mean the corolla tube is strongly curved, and the following four words, “Shí Shān Jù Tái,” mean Petrocodon in Chinese.
Jin-Xin Wei, Bo Pan and Tao Ding. 2025. Petrocodon curvitubus, A New Species of Gesneriaceae from Guangxi, China. PhytoKeys. 252: 77-85. DOI: doi.org/10.3897/phytokeys.252.136306
