Abstract
Persicaria genus in Turkish Madımakgiller or Buckwheat family (Polygonaceae) is included in the genus Polygonum now. Today, the genus Persicaria is separated from the genus Polygonum. In this study, Pe. hydropiperoides belonging to the genus Persicaria is given as a new species for the flora of Turkey. Specimens of Pe. hydropiperoides were collected from Sancaktepe/ Paşaköy (Istanbul). Adding this new species, the number of Persicaria genus in Turkish Flora reached 12 species (13 taxa). Additionally, a Turkish name, detailed description, locality data, photographs, and geographical distribution information of the species were given in this research.
Highlights
Persicaria samples were gathered from the Anatolian side of Istanbul in November 2019 during field investigations conducted by the first author as a part of his doctoral dissertation research
The former name Polygonum hydropiper at first appearance, the current name Pe. hydropiper it resembles 'hydropiper', as a result of detailed examination, it is an unknown species from Turkey belonging to the genus Persicaria; as a result of the literature study (Webb and Chater, 1964; Small, 1895) and herbarium (E, EGE, ISTE, ISTF, ISTO, ANK, MUFE and NGBB)
It is expected that Pe. hydropiperoides extend across a larger region than the 2-3 km2 region where the samples were gathered
Summary
Polygonaceae Juss (Buckwheat in English or Madımakgiller in Turkish), which contains around 50 genera and 1200 species worldwide, is usually found in temperate zones of the Northern Hemisphere and is only rarely found in tropical climates (Heywood, 1978; Freeman and Reveal, 2005). The number of taxa grew by 11 in Polygonaceae, the Flora of Turkey, and the Eastern Aegean Islands (Davis et al, 1967; Coode and Cullen, 1967). With the splitting of Persicaria from Polygonum in recent years, Turkey possesses 12 genera (Brandbyge, 1993; Keskin and Severoglu, 2020). In Polygonum, the ocrea is normally membranous, silvery, and glabrous, with a two-lobed apex that is typically fibrous and glabrous. The ocrea tube of Persicaria is not membranous, but rather fleshy, brown or reddish, rarely silvery, hairy, or glabrous, seldom 2-lobed at the tip, and frequently ripped apart by aging (Webb and Chater, 1964; Davis et al, 1967; Hinds and Freeman, 2020)
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