Abstract
A cryptic species of Fagopyrum (Polygonaceae), F. homotropicum, is described and illustrated from Mangkang county, Tibet, China. F. homotropicum was firstly discovered in the 90’s, being to be diploid and characterized being a self-pollinating taxon. Detailed information of F. homotropiucm was rarely reported. In this paper, we summarized the morphological and karyological characters of tetraploid form F. homotropiucm (2n=4x=32), it is self-pollinating, and morphology indistinguishable in comparison from the diploid form.
References
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<p>Zhou, M., Tang, Y., Deng, X., Ruan, C., Tang, Y. & Wu, Y. (2018) Classification and Nomenclature of Buckwheat Plants. <em>Buckwheat Germplasm in the World</em>: 9–20. https://doi.org/10.1016/B978-0-12-811006-5.00002-1</p>
<p>Kim, Y.B., Kim, S.L., Lee, K.C., Chang, K.J., Kim, N.S., Shin, Y.B. & Park, C.H. (2002) Interspecific hybridization between Korean buckwheat landraces (<em>Fagopyrum esculentum</em> Moench) and self-fertilizing buckwheat species <em>(F. homotropicum ohnishi</em>). <em>Fagopyrum</em> 19: 37–42.</p>
<p>Linnaeus, C. (1753) <em>Species plantarum</em>, vol. 1. Laurentius Salvius, Stockholm, 560 pp.</p>
<p>Ohnishi, O. & Matsuoka, Y. (1996) Search for the wild ancestor of buckwheat II. Taxonomy of <em>Fagopyrum</em> (Polygonaceae) species based on morphology, isozymes and cpDNA variability. <em>Genes & Genetic Systems</em> 71 (6): 383–390. https://doi.org/10.1266/ggs.71.383</p>
<p>Ohnishi, O. (1998) Search for the wild ancestor of buckwheat. Description of new <em>Fagopyrum </em>(Polygonaceae) species and their distribution in China and the Himalayan hills. <em>Fagopyrum</em> 15: 18–28.</p>
<p>Ohnishi, O. & Asano, N. (1999) Genetic diversity of <em>Fagopyrum homotropicum</em>, a wild species related to common buckwheat. <em>Genetic Resources and Crop Evolution</em> 46 (4): 389–398. https://doi.org/10.1023/A:1008640522979</p>
<p>Ohsako, T. & Ohnishi, O. (2000) Intra-and interspecific phylogeny of wild <em>Fagopyrum</em> (Polygonaceae) species based on nucleotide sequences of noncoding regions in chloroplast DNA. <em>American Journal of Botany</em> 87 (4): 573–582. https://doi.org/10.2307/2656601</p>
<p>Ohsawa, R. (2020) Current status and prospects of common buckwheat breeding in Japan. <em>Breeding science</em> 70 (1): 3–12. https://doi.org/10.1270/jsbbs.19108</p>
<p>Thiers, B. (2021) <em>Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium</em>. Available from: http://sycamore.nybg.org/science/ih (accessed 30 November 2021)</p>
<p>Treviranus, L.C. (1826) Horti botanici Vratislaviensis plantarum vel novarum vel minus cognitarum manipulus: descripsit et observationibus nec non tabulis tribus illustravit. <em>Nova Acta Physico-medica Academiae Caesareae Leopoldino-Carolinae Naturae Curiosorum</em> <em>Exhibentia Ephemerides sive Observationes Historias et Experimenta </em>13 (5): 165–208.</p>
<p>Varoquaux, F., Blanvillain, R., Delseny, M. & Gallois, P. (2000) Less is better: new approaches for seedless fruit production. <em>Trends in biotechnology</em> 18 (6): 233242. https://doi.org/10.1016/S0167-7799(00)01448-7</p>
<p>Zhang, K., Fan, Y., Weng, W., Tang, Y. & Zhou, M. (2021) <em>Fagopyrum longistylum</em> (Polygonaceae), a new species from Sichuan, China. <em>Phytotaxa</em> 482 (2): 173–182. https://doi.org/10.11646/phytotaxa.482.2.5</p>
<p>Zhou, M., Tang, Y., Deng, X., Ruan, C., Tang, Y. & Wu, Y. (2018) Classification and Nomenclature of Buckwheat Plants. <em>Buckwheat Germplasm in the World</em>: 9–20. https://doi.org/10.1016/B978-0-12-811006-5.00002-1</p>