Novelties in the genus Polygonum (Polygonaceae) in Turkey Author Keskin, Mustafa 0000-0003-2454-1891 Marmara University, Institute of Pure and Applied Sciences, Biology Program, 34722, Goztepe, Istanbul, Turkey & trifolium @ hotmail. com; https: // orcid. org / 0000 - 0003 - 2454 - 1891 trifolium@hotmail.com Author Severoğlu, Zeki 0000-0002-3420-3557 Marmara University, Science and Education Faculty, Biology Department, Department of Plant Diseases and Microbiology, 34722, Goztepe, İstanbul, Turkey & zseveroglu @ marmara. edu. tr; https: // orcid. org / 0000 - 0002 - 3420 - 3557 zseveroglu@marmara.edu.tr text Phytotaxa 2022 2022-03-07 538 2 113 123 journal article 20287 10.11646/phytotaxa.538.2.3 92d46141-6d3f-4554-b5de-64285fa4faff 1179-3163 6333680 Polygonum rurivagum Jord. ex Boreau ≡ P. aviculare subsp. rurivagum (Jord. ex Boreau) Berher ≡ P. heterophyllum subsp. rurivagum (Jord. ex Boreau) Lindm. Type : not designated. Description:― Annuals. Stems 5–30 cm long, prostrate, striate, main branch longer than others. Ochrea 5–12 mm long, brown at the tube, prominently veined, later divided into linear strands. Nods slightly swollen. Petioles 1–8 mm , longer than ochrea at middle and included in ochrea at the upper side. Leaves 5–12 × 1–3 mm , elliptic to lanceolate, obtuse at apex, rarely acute; veins prominent and branched at the bottom. Inflorescences 1–3-flowered fascicles. Pedicel shorter than ochrea. Tepal 2.0– 3.5 mm , pink or whitish. Styles 3 with shorter stigma. Stamens 7–8. Achenes trigonous, 2.2–3.0 mm, roughly veined and tuberculate, dark brown; achenes somewhat large and long, pyriform in late season. Vernacular name:― The authors propose “Delice madımak” as a vernacular name for P. buxiforme according to the guidelines of Menemen et al . (2016) . Note:― It is very similar to Polygonum neglectum but easily differentiated by shape and size of leaves; ochrea shape and size. P. rurivagum is often found in urban areas due to its higher adaptability ( Table 2 ). Examined specimens:― TURKEY . İstanbul : Beykoz , Riva creek edge, slopes, forest–bush span, meadow, 20 m , 13 October 2019 , Keskin 7869 (MUFE!) . İstanbul : Beykoz , Riva , near center, roadside, openings, 5 m , 13 October 2019 , Keskin 7872 (MUFE!) . İstanbul : Adalar , Kınalıada , above part, slopes overlooking the sea, 10 m , 3 November 2019 , Keskin 7878 (MUFE!) . İstanbul : Adalar , Burgazada , above parts, 15 m , 16 November 2019 , Keskin 7885 and 7887 (MUFE!) . İstanbul : Adalar , Kınalı ada, 23 November 2019 , Keskin 7891 and 7893 (MUFE!) . İstanbul : Kadıköy , Marmara University Göztepe campus, 28 November 2019 , Keskin 7896 (MUFE!) . İstanbul : Kartal , Yakacık , roadside, 6 July 2019 , Keskin 7898 (MUFE!) . İstanbul : Þile , Hacıllı village , roadside, 04 January 2020 , Keskin 7905 (MUFE!) . İstanbul : Þile , Hacıllı village , valley, 04 January 2020 , Keskin 7906 (MUFE!) . İstanbul : Maltepe , Baþıbüyük district , center area, near to small mosque, empty area, 31 January 2020 , Keskin 7917 (MUFE!) . İstanbul : Fatih , Beyazıd, garden of İstanbul Üniversitesi , 15 November 1964 , Avcıgil (ISTE 7865! and MUFE!) . İstanbul : Pendik , Akfırat resort, Göçbeyli village , around fountain, 18 May 2020 , Keskin 7955 (MUFE!) . İstanbul : Maltepe , Yalı District , seaside, port, E 40.929936 and B 29.113378, 3 June 2020 , Keskin 7958 (MUFE!) . İstanbul : Çekmeköy , Ömerli District , Ilgın street, forest, openings, N 41 o 01’ 31,5’’ and E 29 o 16’ 21.0’’ , 19 m , 11 July 2020 , Keskin 8028 (MUFE!) . İstanbul : Çekmeköy , output of Hüseyinli village , 11 m , N 41 o 07’ 07.4’’ and E 29 o 17’ 58.8’’ , 11 July 2020 , Keskin 8037 (MUFE!) . İstanbul : Büyükçekmece , Celaliye village , roadside, 13 September 2020 , Keskin 8085 (MUFE!) .