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Ding B, Nakamura K, Kono Y, et al. Begonia jinyunensis (Begoniaceae, section Platycentrum), a new palmately compound leaved species from Chongqing, China. Bot Stud. 2014;55(1):62doi: 10.1186/s40529-014-0062-6.
Ding, B., Nakamura, K., Kono, Y., Ho, M. J., & Peng, C. I. (2014). Begonia jinyunensis (Begoniaceae, section Platycentrum), a new palmately compound leaved species from Chongqing, China. Botanical studies, 55(1), 62. https://doi.org/10.1186/s40529-014-0062-6
Ding, Bo, et al. "Begonia jinyunensis (Begoniaceae, section Platycentrum), a new palmately compound leaved species from Chongqing, China." Botanical studies vol. 55,1 (2014): 62. doi: https://doi.org/10.1186/s40529-014-0062-6
Ding B, Nakamura K, Kono Y, Ho MJ, Peng CI. Begonia jinyunensis (Begoniaceae, section Platycentrum), a new palmately compound leaved species from Chongqing, China. Bot Stud. 2014 Dec;55(1):62. doi: 10.1186/s40529-014-0062-6. Epub 2014 Aug 02. PMID: 28510980; PMCID: PMC5430339.
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Bot Stud. 2014 Dec;55(1):62. doi: 10.1186/s40529-014-0062-6. Epub 2014 Aug 02.

Begonia jinyunensis (Begoniaceae, section Platycentrum), a new palmately compound leaved species from Chongqing, China.

Botanical studies

Bo Ding, Koh Nakamura, Yoshiko Kono, Meng-Jung Ho, Ching-I Peng

Affiliations

  1. College of Life Science and Engineering, Chongqing Three Gorges University, Chongqing, 404000, China.
  2. Herbarium (HAST), Biodiversity Research Center, Academia Sinica, Taipei, 11542, Taiwan. [email protected].
  3. Herbarium (HAST), Biodiversity Research Center, Academia Sinica, Taipei, 11542, Taiwan.
  4. Herbarium (HAST), Biodiversity Research Center, Academia Sinica, Taipei, 11542, Taiwan. [email protected].

PMID: 28510980 PMCID: PMC5430339 DOI: 10.1186/s40529-014-0062-6

Abstract

BACKGROUND: Continental China is the center of Begonia species diversity in Asia and contains more than 60 species out of about 110 named species of section Platycentrum. Mt. Jinyun, located in Chongqing City at the upper reaches of the Yangtze River, harbors a subtropical broadleaved forest with high species diversity. During a botanical survey in Mt. Jinyun, an unknown Begonia species of sect. Platycentrum with palmately compound leaves was collected and studied based on detailed morphological observations and cytological and molecular phylogenetic analyses.

RESULTS: The unknown Begonia bears a superficial resemblance to B. hemsleyana in having palmately compound leaves, a feature unseen in other species of sect. Platycentrum in China. It is however sharply distinct from the latter in the acaulous habit with aerial stems seen only at anthesis and long rhizomes (vs. erect stems to 70 cm or taller with short rhizomes), 4-6 pinnatilobed leaflets with indistinct, decurrent petiolules (vs. 7-10 serrate leaflets with distinct petiolules), and white (vs. pink) tepals. Molecular phylogenetic analyses based on nuclear ribosomal DNA and chloroplast DNA sequences indicated that this species was allied to Platycentrum species occurring in Southwest and South-central China and Vietnam, including B. hemsleyana, and clearly separable from these species. Somatic chromosome number of 2n = 22 was reported for this unknown species. The diploid chromosome number is agreeable with those published for Begonia sect. Platycentrum.

CONCLUSIONS: The unknown Begonia is confirmed to be a new species of sect. Platycentrum and hereto described as Begonia jinyunensis C.-I Peng, B. Ding & Q. Wang.

Keywords: Begonia hemsleyana; Begonia jinyunensis; Begoniaceae; Chromosome number; Flora of China; ITS; Limestone; New species; Sect. Platycentrum; rpl16

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