Polygonum neglectum Besser (1821: 45)

Keskin, Mustafa & Severoğlu, Zeki, 2022, Novelties in the genus Polygonum (Polygonaceae) in Turkey, Phytotaxa 538 (2), pp. 113-123 : 119

Polygonum neglectum Besser (1821: 45)

≡ P. aviculare subsp. neglectum (Besser) Arcang.

Type:― Not designated.

Description:― Annuals. Stems 10–60 cm long, prostrate, striate, rather slender, flexuous, and weak, with somewhat elongated internodes. Nodes slightly swollen. Ochrea 3–8 mm long, hyaline, deeply lacerate with age at the apex. Petioles 0–2 mm long, generally included in ochrea. Leaves subequal, 4–16 × 1–1.5 mm, narrow, linear or linear– elliptic, acute. Bracts the same as the leaf. Inflorescences 1–4 flowered fascicles, barely exserted from the sheathing stipules in leaf axils. Pedicels tiny, somewhat winged, generally shorter than ochrea. Tepal 5, pink to reddish rarely white, 1.8–2.5 mm long, branched vein present on the outer face; lobes narrow, obtuse to spathulate–rounded, often ascending and not overlapping in fruit. Styles 3 with 3 short stigmas. Stamens 7–8; filaments dilated at the base. Achene trigonous 2–3 mm long, often exserted from the persistent tepal, surface punctuate; achenes light brown somewhat long apex and longer than from tepals in late season.

Vernacular name:― The authors propose “Zarif madımak” as a vernacular name for Polygonum buxiforme according to the guidelines of Menemen et al. (2016).

Note:― Polygonum neglectum is related to P. aviculare but easily distinguished by thin, long and uniform leaves throughout the entire plant. The other is the type of P. rurivagum that is nearby. P. neglectum can be separated by short ochrea, leaf type, line veins, and dimensions.

Examined specimens:― TURKEY. İstanbul: Pendik, Göçbeyli village , N 40,996 99 and E 29,457 546, 9 July 2019, Keskin 7855 (MUFE!) . İstanbul: Beykoz, Riva shore, 0 m, 13.x.2019, Keskin 7868 (MUFE!) . İstanbul: Beykoz, Riva , above part, tops, open meadows, 65 m, 13 October 2019, Keskin 7871 (MUFE!) . İstanbul: Adalar: Kınalıada , above part, slopes overlooking the sea, 25 m, 3 November 2019, Keskin 7880 (MUFE!) . İstanbul: Beykoz, Polenezköy , roadside, 21 June 2019, Keskin 7913 (MUFE!) . İstanbul: Sarıyer, Belgrad forest , 29 October 1964, Baytop (ISTE 7793!) . İstanbul: Adalar, Büyükada, back face, Fayton station , 8 March 2020, Keskin 7922 (MUFE!) . İstanbul: Çekmeköy, Ömerli District, Ilgın street, Þile return, forest edge, open slopes, N 41.081349 and E 29.334089, 19 m, 25 June 2020, Keskin 8008 (MUFE!) . İstanbul: Beykoz, Bozhane village , N 41 o 09’ 56.3’’ and E 29 o 16’ 42,9’’, 41 m, 11 July 2020, Keskin 8039 (MUFE!) . İstanbul: Beykoz, Göllü village , N 41 o 10’ 41,5’’ and E 29 o 17’ 10.6’’, 54 m, 11 July 2020, Keskin 8041 (MUFE!) . İstanbul: Beykoz, Cumhuriyet village , N 41 o 07’ 31.3’’ and E 29 o 16’ 08.6’’, 29 m, 11 July 2020, Keskin 8045 (MUFE!) . İstanbul: Beykoz, Polenezköy forest , 12 September 2020, Keskin 8079 (MUFE!) .