Polygonum istanbulicum Keskin sp. nov. (Polygonaceae) from Turkey

Polygonum istanbulicum Keskin sp. nov. (Polygonaceae) from Turkey

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Polygonum istanbulicum Keskin sp. nov. (Polygonaceae) from Turkey Mustafa Keskin M. Keskin (trifolium@hotmail.com), Go¨ztepe Campus, Science Inst., Marmara Univ., Kadıko¨y, TR ± 34722 I ˙ stanbul, Turkey. A new Polygonum L. species, P. istanbulicum Keskin, is described from the I ˙ stanbul province of Turkey and is compared with other allied species. In addition, an updated list of all Polygonum (s. l.) species recorded from Turkey is provided. The first samples of the new species described in this article were collected from the Bas¸ıbu ¨yu ¨k district of Maltepe/ I ˙ stanbul in 1995 by the author. However, it could not be established as a new species until the flora list of the Bas¸ıbu ¨k district was finished. The flora of this district, despite being only a small part of I ˙ stanbul city, consists of 532 taxa including 11 endemic species. Floras of the neighbouring countries (Hala ´csy 1904, Hayek 1927, Komarov 1936, Rechinger and Schiman-Czeika 1968, Meikle 1985, Akeroyd 1986, Snogerup and Snogerup 1997) have been checked as well as specimens from numerous herbaria to ascertain that the species described here is really new to science. Keskin sp. nov. (sect. Polygonum ) (Fig. 1) Herba perennis, radice lignosa. Caules prostrati, numerosi, simplices vel superne ramosi, 5 ± 80 cm lg., tenues, striati. Internodia 5 ± 40 mm lg., pustulata. Ochreae membranaceae, 10 mm lg., inferiores rubro-castaneae, superiores pallidae. Folia anguste oblonga vel lanceolata, 5 ± 13 ² 10 ± 30 cm, breviter petiolata, ad marginem revoluta, undulata, nervis prominentibus provisa. Bracteae foliis caulinis similes sed minores. Inflorescentia dense spicata. Flores axillares in nodis 2 ± 3( ± 4) congesti, pedicellis inaequalibus, ad 4 mm lg. Perigonium 2.5 ± 4 mm lg., infundibuliformi-campanulatum, lobis albidis vel subroseis, fructiferis rubris, tubo paulo longioribus. Stamina 8; stigma trilobum. Nux ad 6 mm lg., perigonio paulo longior, brunnea. Type: Turkiye A2(A) I ˙ stanbul: Maltepe, ¨k district, forest of Su ¨reyyapas¸a hospital, 40 8 56 ? 58.5 ƒ N, 29 8 08 ? 20.9 ƒ E, 69 m a.s.l., 24 Aug 2006, M. Keskin 5105 (holotype: ISTE 83798, isotypes: ANK, ISTF, MUFE, herbarium M. Keskin). Suffuticose perennial with a hard woody stock. Stems numerous, branched at the base and above, prostrate, 5 ± 80 cm, conspiciously sulcate; internodes 5 ± 40 mm, pustulate. Ocreae membraneous, up to 10 mm, lower reddish ± brown, veined, upper hyaline glabrous, entire when young but becoming lacerate when mature. Leaves numerous, shortly petiolate or sub-sessile, linear or lanceolate, 5 ± 13 ² 10 ± 30 mm, entire, green, pustulate, margin strongly revolute and somewhat undulate, veins prominent. Bracts similar to but smaller than the cauline leaves. Inflorescences generally branched, spicate, dense. Flowers 2 ± 3( ³ 4) at each node, with pedicels of uneaqual length, longest pedicels 4 mm, violet ± pink. Buds dark red.
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Polygonum istanbulicum Keskin sp. nov. (Polygonaceae) from Turkey

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