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Petrocodon vietnamensis sp. nov. (A) plant in bloom, (B) adaxial surfaces of leaf blades and petioles, (C) abaxial surfaces of leaf blades and petioles, (D) cymes, (E) top view of corolla, (F) lateral view of corolla, (G) pistil, (H) opened corolla, (I) calyx lobes (two adaxial surfaces on the left; three abaxial surfaces on the right), (J) mature infructescence (Photographs by F. Wen).
Source publication
Petrocodon vietnamensis, a new species from karst cave in north Vietnam is described
and illustrated. It is morphologically close to P. bonii, but can be distinguished from
the latter by having a green, 3–6 cm long peduncle; green, ca 5 mm long calyx lobes;
narrow infundibuliform, a 1.1–1.2 cm long corolla tube; ovate abaxial lip lobes; pink
to whi...
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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...
Citations
... Wei, and Tengia Chun, as well as all species of the small genus Lagarosolen W.T. Wang, four species of Didymocarpus Wall., one species of Wentsaiboea D. Fang & D.H. Qin, one species of Primulina Hance, and recently all but the type species of Allocheilos W.T.Wang (Wang et al. 2011;Weber et al. 2011;Xu et al. 2014;Liu et al. 2024). In recent years additional taxa have been discovered in Petrocodon such as P. villosus Xin Hong, F (Hong et al. 2014;Lu et al. 2017;Su et al. 2019;Tan et al. 2023 (Pellegrin 1926;Li 1982;Vu 2006;Weber et al. 2011;Middleton et al. 2015;Vu 2017;Xin et al. 2021;Xiong et al. 2024). ...
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.
Petrocodon is a small genus in the family Gesneriaceae, which is special for its remarkable floral diversity, and has high ornamental value. In this study, the complete chloroplast genome sequence and genome characteristics of Petrocodon longitubus are first reported. The genome size is 152,958 bp, including a large single-copy region (LSC, 83,901 bp), a small single-copy region (SSC, 18,255 bp), and two inverted repeat sequences (IRs, 25,401 bp, each). The chloroplast genome of P. longitubus was analyzed, revealing a total GC content of 37.47%. A total of 131 genes were de novo assembled, consisting of 87 protein-coding genes, 36 tRNA genes, and 8 rRNA genes. A comparative analysis was conducted between the chloroplast genome of P. longitubus and three other published species of Petrocodon. The chloroplast genome of four Petrocodon species was found to have a double-chain ring structure, with a size ranging from 152,958 to 153,292 bp. Chloroplast genome size had indistinguishable. Four Petrocodon species was ra elatively conserved sequence, with 87 or 88 protein-coding genes, and 8 rRNA were the most conserved, which contains 42 ~ 50 SSR sites, which are mainly mononucleotides and dinucleotides, 4 boundary transition regions, then trinucleotides, pentanucleotides and hexanucleotides have been not detected. The non-preferred codons of the chloroplast genome in the four Petrocodon species are those ending in A, C, G, or T. The chloroplast genomes of these four Petrocodon species are highly similar to each other and to several Primulina species. Phylogenetic trees indicate that P. longitubus and other Petrocodon species were grouped together in a clade, with P. longitubus form a single clade. The results support the scientific naming of P. Longitubusr based on horticultural traits and further clarify the systematic status using molecular information.
A new lithophytic species of Gesneriaceae, Petrocodon rubrostriatus K.Tan, X.Q.Song & M.X.Ren, sp. nov. from Lvchun County, South Yunnan, China, is described and illustrated here. It closest resembles P. mollifolius (W.T.Wang) A.Weber & Mich.Möller, but the new species is differentiated from it by red to brownish-red stripes in the yellow corolla throat and 4.5 mm long bract lobes, a ca. 10 mm long style, and staminodes inserted at 2.5–3 mm from the corolla base. The species is preliminarily assessed as ‘Critically Endangered’ (CR) according to IUCN criteria, since currently only one single locality is known with a few subpopulations on a fragmented limestone cliff, with fewer than 300 individuals.
Petrocodon asterostriatus F. Wen, Y.G. Wei & W.C. Chou sp. nova (Gesneriaceae) is described and illustrated. It is a lithophytic species that grows in the limestone area of southwestern Guangxi, China. According to the maximum likelihood (ML) analysis, it nests in a strongly supported clade (BP = 92%) that includes P. lui, P. tiandengensis, P. integrifolius, P. albinervius and P. ionophyllus. Of these, P. asteriostriatus is morphologically closest to P. integrifolius, but can be distinguished from it by the shape and size of bracts, the indumentum of the pedicel, the shape and indumentum of the corolla tube, the shape of the lip lobes, and the indumentum and glands of filaments.
