Research Paper

Persicaria subterranea, a new species of Polygonaceae (Polygonoideae: Persicarieae) from Xizang of southwest China

Zhen-Hua Zhu, Shu-Qing Lei, Bo Li

Published on: 04 June 2024

Page: 237 - 243

DOI: 10.6165/tai.2024.69.237


Persicaria subterranea Bo Li, a new species from Xizang in southwestern China, is described and illustrated in this study. Gross morphology and pollen micromorphology corroborate its placement within Persicaria sect. Cephalophilon. Unique to this section, P. subterranea is the only species known to exhibit subterranean cleistogamous flowers, making it distinct within the sect. Cephalophilon. Morphologically, it shows the closest resemblance to P. glacialis (Meisn.) H. Hara and its variety, P. glacialis var. przewalskii (A.K. Skvortsov & Borodina) M.J. Kong & S.P. Hong. However, it could be readily distinguished from these related taxa by leaf shapes and indumentum, inflorescence structure, number of stamens, and achene morphology. In addition, we provide diagnostic characteristics, a detailed morphological description, line drawing, and information on the distribution and habitat for this new species, as along with comparable photographs of the three related taxa.

Keyword: Capitate inflorescence, Cephalophilon, cleistogamy, palynology, Persicaria glacialis, Polygonum, Tibet

Literature Cited

Ayodele, A.E. 2005 The morphology and taxonomic significance of pollen in the West African Polygonaceae. Thaiszia Journal of Botany 15: 143–153.

Ayodele, A.E., Zhou, Z.K. 2010 Scanning electron microscopy of fruits in the West African Polygonaceae. J. Syst. Evol. 48(5): 336–343.
DOI: 10.1111/j.1759-6831.2010.00093.xView Article Google Scholar

Bentham, G., Hooker, J.D. 1880 Genera Plantarum 3(1). Lovell Reeve & Co., London, 459 pp.

Brandbyge, J. 1993 Polygonaceae. In: Kubitzki, K. and V. Bittich. (eds.), The Families and Genera of Vascular Plants 2. Springer Verlag, Berlin, pp. 531–544.

Burke, J.M., Sanchez, A., Kron, K. Luckow, M. 2010 Placing the woody tropical genera of Polygonaceae: a hypothesis of character evolution and phylogeny. Am. J. Bot. 97(8): 1377–1390.
DOI: 10.3732/ajb.1000022View Article Google Scholar

Cao, D.L., Zhang, X.J., Qu, X.J. Fan, S.J. 2022 Plastid phylogenomics sheds light on divergence time and ecological adaptations of the tribe Persicarieae (Polygonaceae). Front. Plant Sci. 13: 1046253.
DOI: 10.3389/fpls.2022.893201View Article Google Scholar

Dammer, U. 1893 Polygonaceae. In Engler, H. and K. Prantl (eds.) Die Nat?rlichen Pflanzenfamilien. (3rd edition) 1a. Engelmann Verlag, Leipzig, pp. 1–36.

Erdtman, G. 1960 The acetolysis method: a revised description. Svensk Botanisk Tidskrift 54: 561–564.

Freeman, C.C. 2005 Polygonaceae. In: Flora of North America Editorial Committee (eds.), Flora of North America. Vol. 5. Oxford University Press, New York, pp. 574–594.

Galasso, G., Banfi, E., Mattia, F.D., Grassi, F., Sgorbati, S. Labra, M. 2009 Molecular phylogeny of Polygonum L. s.l. (Polygonoideae, Polygonaceae), focusing on European taxa: preliminary results and systematic considerations based on rbcL plastidial sequence data. Atti della Societa Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano 150: 113–148.

Haraldson, K. 1978 Anatomy and taxonomy in Polygonaceae subfamily Polygonoideae Meisn. emend. Jaretzky. Symbolae Botanicae Upsalienses 22: 1–95.

Hedberg, O. 1946 Pollen morphology in the genus Polygonum L. s.l. and its taxonomical significance. Sven. Bot. Tidskr. 40: 371– 414.

Hong, S.P., Hedberg, O. 1990 Parallel evolution of aperture numbers and arrangement in the genus Koenigia, Persicaria and Aconogonon (Polygonaceae). Grana 29(3): 177–184.
DOI: 10.1080/00173139009427750View Article Google Scholar

Hou, Y.T. 2006 Systematic studies on the tribe Polygoneae of China. Shandong Normal University, Jinan, 290 pp.
DOI: 10.18077/chss.2008.44..011View Article Google Scholar

Kantachot, C., Chantaranothai, P. 2011 Achene Morphology of Polygonum s.l. (Polygonaceae) in Thailand. Trop. Nat. Hist. 11(1): 21–28.

Keskin, M., Severolu, Z. 2020 The genus Persicaria (Polygonaceae) in Turkey with a new taxon record. EMU J. Pharm. Sci. 3 (2): 97–105.

Kim, S.T., Donoghue, M.J. 2008a Molecular phylogeny of Persicaria (Persicarieae, Polygonaceae). Syst. Bot. 33(1): 77–86.
DOI: 10.1600/036364408783887302View Article Google Scholar

Kim, S.T., Donoghue, M.J. 2008b Incongruence between cpDNA and nrITS trees indicates intensive hybridization within Eupersicaria (Polygonaceae). Am. J. Bot. 95(9): 1122–1135.
DOI: 10.3732/ajb.0700008View Article Google Scholar

Kong, M.J., Hong, S.P. 2018 Comparative achene morphology of Persicaria sect. Cephalophilon and related taxa (Polygonaceae). Korean J. Pl. Taxon. 48(2): 134?142.
DOI: 10.11110/kjpt.2018.48.2.134View Article Google Scholar

Kong, M.J., Song, J.H., Hong, S.P. 2021 Pollen morphology of Persicaria section Cephalophilon (Polygonaceae). Pl. Syst. Evol. 307(2): 16.
DOI: 10.1007/s00606-020-01738-9View Article Google Scholar

Kong, M.J., Song, J.H., An, B.C., Son, S.W., Suh, G.U., Chung, M.J. Hong, S.P. 2018 A comparative study of achene morphology in Korean Polygonaceae. Bangladesh J. Plant Taxon. 25 (2): 135–148.
DOI: 10.3329/bjpt.v25i2.39536View Article Google Scholar

Li, A.J. 1998 Polygonaceae. In Li, A.J. (ed.) Flora Reipublicae Popularis Sinicae 25(1). Science Press, Beijing, pp. 1–237.

Li, A.J., Bao, B.J., Grabovskaya-Borodina, A.E., Hong, S.P., McNeill, J., Mosyakin, S.L., Ohba, H. Park, C.W. 2003 Polygonaceae. In Li, A.J. (ed.) Flora of China 5. Science Press, Beijing; Missouri Botanical Garden Press, St. Louis, pp. 277–350.

Meisner, C.F. 1856 Polygonaceae. In de Candolle, A. (ed.) Prodomus systematis naturalis regni vegetabilis 14. Masson, Paris, pp. 1–185.

Paul, P, Chowdhury, M. 2020 Pollen morphology of selected Indian species from subfamily Polygonoidae (Polygonaceae). Biologia 75(8): 1083–1095.
DOI: 10.2478/s11756-020-00449-3View Article Google Scholar

Qu, C.Y., Hou, Y.T., Li, A.L., Lu, F.J. Li, F.Z. 2006 Fruit shape and pericarp micromorphological characteristics of Polygonum section Persicaria from China. Bot. J. Linn. 26: 275–285.

Ronse Decraene, L.P., Akeroyd, J.R. 1988 Generic limits in Polygonum and related genera (Polygonaceae) on the basis of floral characters. Bot. J. Linn. 98(4): 321–371.
DOI: 10.1111/j.1095-8339.1988.tb01706.xView Article Google Scholar

Ronse Decraene, L.P., Hong, S.P., Smets, E. 2000 Systematic significance of fruit morphology and anatmy in tribes Persicarieae and Polygoneae (Polygonaceae). Bot. J. Linn. 134(1-2): 301–337.
DOI: 10.1006/bojl.2000.0375View Article Google Scholar

Sanchez, A., Schuster, T.M., Kron, K.A. 2009 A large-scale phylogeny of Polygonaceae based on molecular data. Int. J. Plant Sci. 170(8): 1044–1055.
DOI: 10.1086/605121View Article Google Scholar

Sanchez, A., Schuster, T.M., Burke, J.M., Kron, K.A. 2011 Taxonomy of Polygonoideae (Polygonaceae): a new tribal classification. Taxon 60(1): 151–160.
DOI: 10.1002/tax.601013View Article Google Scholar

Schuster, T.M., Reveal, J.L., Bayly, M.J., Kron, K.A. 2015 An updated molecular phylogeny of Polygonoideae (Polygonaceae): Relationships of Oxygonum, Pteroxygonum, and Rumex, and a new circumscription of Koenigia. Taxon 64(6): 1188–1208.
DOI: 10.12705/646.5View Article Google Scholar

Shahla, S., Maassoumi, A.A., Hamdi, S.M.M., Mehregan, I. Nejadsattari, T. 2014 Fruit morphology of the genus Rumex L.(Polygonaceae) in Iran. Journal of Biodiversity and Environmental Sciences 5 (1): 655–663.

Steward, A.N. 1930 The Polygoneae of Eastern Asia. Contributions from the Gray Herbarium of Harvard University 5: 1–129.
DOI: 10.5962/p.336124View Article Google Scholar

Suyama, C., Ueda, K. 2013 Persicaria geocarpica Suyama & K. Ueda (Polygonaceae), sp. nov., and its endemism and subterranean cleistogamy. Acta Phytotax. Geobot. 63(3): 135–142.

Thiers, B. 2020 (Continuously updated). Index herbariorum: a global directory of public herbaria and associated staff. New York Botanical Garden. Available from: (accessed 10 February 2024)

Tutin, T.G., Burges, N.A., Edmondson, J.R., Heywood, V.H., Moore, D.M., Valentine, D.H., Waiters, S.M., Webb, D.A. 1991. Polygonaceae. In Tutin, T.G. (ed.) Flora Europaea (2nd edition) 1. Cambridge University Press, London, pp. 91–108.

Wang, J.X., Feng, Z.J. 1994 A study on the pollen morphology of the genus Polygonum in China. Acta Phytotaxonomica Sinica 32: 219–231.

Yasmin, G., Khan, M.A., Shaheen, N., Hayat, M.Q., Zafar, Ahmad, M.M. 2010 Pollen morphological diversity in selected species of Persicaria Mill. (Family; Polygonaceae). J. Med. Plants Res. 4: 862–870.

Zhang, L.S., Chen, C.L., Ma, X.X., Liu, J.Q. 2022 Phylogenomics and evolutionary diversification of the subfamily Polygonoideae. J. Syst. Evol. 61 (4): 587–598.
DOI: 10.1111/jse.12913View Article Google Scholar