Monday, March 11, 2019

[Botany • 2019] Petrocodon tongziensis (Gesneriaceae) • A New Species from Limestone Areas in Guizhou, China based on Morphological and Molecular Evidence

Petrocodon tongziensis R.B.Zhang & F.Wen

in Zhang, Deng, Fu, et al., 2019. 
  DOI: 10.1111/njb.01774  

Petrocodon tongziensis R.B.Zhang & F.Wen, a new species from northern Guizhou province, China, is described and illustrated based on molecular and morphological evidence. The new species was found growing in crevices and on tufa of moist surfaces of limestone hills in Tongzi County. A maximum parsimony (MP) analysis based on the combined ITS and trnL‐F DNA regions showed that the new species falls within a large polytomy within Petrocodon, but is resolved as most closely related to an unidentified species (WF2014) and these two taxa are in turn resolved as sister to Petrocodon hunanensis X.L.Yu & Ming Li. This is congruent with the fact that both P. hunanensis and P. tongziensis have four fertile stamens, a character state likely to be an ancestral state distinguishing this clade from the rest of Petrocodon. Petrocodon tongziensis differs from P. hunanensis by lacking a terrestrial stem, as well as by the number of bracts, presence of bracteoles, shape of the lobes of the upper lip, and reduced number and length of staminodes.

Petrocodon tongziensis R.B.Zhang & F.Wen sp. nov. 

Etymology: The specific epithet is derived from the type locality, Tongzi county, Guizhou province, China.

Ren‐Bo Zhang, Tan Deng, Long‐Fei Fu, Shu Li, Lin He, Quan‐Li Dou and Fang Wen. 2019. Petrocodon tongziensis (Gesneriaceae), A New Species from Limestone Areas in Guizhou, China based on Morphological and Molecular Evidence. Nordic Journal of Botany. 37(2)  DOI: 10.1111/njb.01774  

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