The difference of indumentum between Petrocodon rubiginosus Y.G.Wei & R.L.Zhang, sp. nov. (A) and Pet. hechiensis (Y.G.Wei, Yan Liu & F.Wen) Y.G.Wei & Mich.Möller (B): densely curly rubiginous to ferruginous villous on surface of petiole (A–1), pedicel (A–2) and calyx lobes (C–1) and densely short glandular-pubescent and pubescent on surface of petiole (B–1), pedicel (B–2) and calyx lobes (C–2).

 
 
  Part of: Zhang R-L, Li S, Maciejewski S, Wei Y-G (2020) Petrocodon rubiginosus, a new species of Gesneriaceae from Guangxi, 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: 175-181. https://doi.org/10.3897/phytokeys.157.32270