Abstract
Impatiens sigmoidea was described in 1908 by the eminent British plant taxonomist J. D. Hooker based on specimens collected by the French missionaries E. M. Bodinier et al. from Guizhou, China. However, there has been no other records since then. After years of concern, we rediscovered I. sigmoidea in one of its type localities, Gao-po Town, in 2018. A revised description, colour photographs and a provisional IUCN Red List assessment of this species are provided, along with discussions of its geographical distribution, ecology and morphological comparison with I. lasiophyton. The lectotype of I. sigmoidea is also designated here. The rediscovery provides an essential basis for enriching the botanical resources of the genus Impatiens.
References
<p>Chen, Y.L. (2001) Balsaminaceae. In: Chen YL. (ed.) Flora Reipublicae Popularis Sinica, Vol. 47. Science Press, Beijing, pp. 1–243.<br>Chen, Y.L., Akiyama, S. & Ohba, H. (2007) Balsaminaceae. In: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) Flora of China, Vol 12. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, pp. 43–113.<br>Grey-Wilson, C. (1980) Impatiens of Africa. CRC Press, Rotterdam, 235 pp.<br>Hooker, J.D. (1908a) Les Espèces Du Genre “Impatiens” dans l’Herbier du Museum de Paris. Nouvelles Archives du Musvéum d’Histoire Naturelle, Paris, ser.4, 10: 233–272.<br>Hooker, J.D. (1908b) Hooker’s Icons Plantarum. Dulau & Co., Ltd. London. pp. 2851–2897.<br>IUCN. (2019) Guidelines for using the IUCN Red List Categories and Criteria, Version 14. Prepared by the Standards and Petitions Subcommittee. <br>Kuang, R.P. (2015) Study on the flora in Guizhou/southern Sichuan and phylogenetic problems of Impatiens L. PhD Thesis, Hunan Normal University, Changsha, 149 pp.<br>Linnaeus, C. (1753) Species Plantarum. Laurentius Salvius, Stockholm, 1200 pp.<br>Luo, Y. & Dun, L.X. (2015) Guizhou vascular plant catalogue. China Forestry Publishing House, Beijing, 554 pp.<br>Liang, X.L., Kuang, R.P., Peng, Y.C. & Cong, Y.Y. (2020) Newly recorded plants of Impatiens from Guizhou province. Life Science Research 24: 494–498.<br>Mabberley, D.J. (2017) Mabberley’s Plant-book, a portable dictionary of plants, their classification and uses. Cambridge University Press, 1040 pp. https://doi.org/10.1017/9781316335581<br>Peng, S., Cong, Y.Y., Tian, J. & Zhang, C.F. (2021) Impatiens bullatisepala (Balsaminaceae), a new species from Guizhou, China. Phytotaxa 500: 217–224. https://doi.org/10.11646/phytotaxa.500.3.5<br>Song, Y., Yuan, Y.M. & Küpfer, P. (2003) Chromosomal evolution in Balsaminaceae, with cytological observations on 45 species from Southeast Asia. Caryologia 56: 463–481.<br>Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.H., Li, D.Z., Marhold, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. & Smith, G.F. (Eds.) (2018) International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Glashütten: Koeltz Botanical Books. https://doi.org/10.12705/Code.2018<br>Xiong, Y.X. (1990) Distribution and relationships of the Balasminaceae in Guizhou. Journal of Guizhou Agricultural College 9: 51–57.<br>Xiong, Y.X. (1996) Two new species of Impatiens from Guizhou. Acta Phytotaxonomica Sinica 34: 98–101.<br>Xiong, Y.X. & Cao, W. (2017) Review of researches on plant taxonomy in Guizhou. Journal of Mountain Agriculture and Biology 36 (1): 1–11.<br>Yuan, Y.M., Song, Y., Geuten, K., Rahelivololona, E., Wohlhauser, S., Fischer, E., Smets, E. & Küpfer, P. (2004) Phylogeny and biogeography of Balsaminaceae inferred from ITS sequences. Taxon 53 (2): 391–403. https://doi.org/10.2307/4135617<br>Yuan, T.H., Li, M.J., Ren, L.Y., Huang, R.X., Chen, Y. & Bai, X.X. (2022) A dataset on the diversity and geographical distributions of wild Impatiens in China. Biodiversity Science 30 (5): 118–122. https://doi.org/10.17520/biods.2022019<br>Yu, S.X. (2012) Balsaminaceae of China. Peking University Press, Beijing, 214 pp.<br>Yu, S.X., Steven, B., Janssens, S. & Zhu, X.Y. (2016) Phylogeny of Impatiens (Balsaminaceae): integrating molecular and morphological evidence into a new classification. Cladistics 32 (2): 179–197. https://doi.org/10.1111/cla.12119<br>Yu, S., Li, M.J., Yuan, T.H., Ren, L.Y. & Bai, X.X. (2021) Species Diversity and geographic distribution of wild Impatiens in Guizhou Province. Acta Botanica Boreali Occidentalia Sinica 41: 863–871.</p>