Potamogeton crispus Linnaeus 1753

Abstract

Potamogeton crispus Linnaeus (1753:126), Fig. 8 Perennial, growing aseasonally, rhizome slender, stem slender, compressed, bicanaliculate. Leaves monomorphic; submersed leaves 20–100 mm long, 4–18 mm wide, margins serrate, undulate, rounded at apex, cuneate at base, 3(–5)- veined; stipules not fused, 6–7 mm long, membranaceous. Spike 10–15 mm long, peduncle 30–45 mm long; as thick as stem. Tepals 1–1.5 mm long, anthers 1 mm long. Carpels 4, fruits 5 mm long, with prominent beak. Stele of oblong type, endodermis of O-type, interlacunar bundles absent, subepidermal bundles absent. Worldwide distribution: —Subcosmopolitan; Europe, Africa, W Asia (Turkey, Afghanistan, Pakistan, Palestine), N, C and E Asia, North and S South America. Australia, introduced to New Zealand. Distribution in Iran: —North, West, Northeast, South. Flowering time: —From spring to summer. Specimen examined:— IRAN. Mazandaran: Azbaran, 100 m, 29 Aug 2015, Abbasi & Afsharzadeh 20206 (HUI!); Siahrood, 62 m, 12 Aug 2014, Abbasi & Afsharzadeh 20217 (HUI!); Gilan: Astara, Stil wetland, 0 m, 16 June 2008, Dinarvand 8235 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); West Azerbaijan: Dalamper fall, 2000 m, 11 Sep 2013, Bagheri 20204 (HUI!); Miandoab, 1000 m, 8 Aug 2015, Abbasi & Afsharzadeh 20205 (HUI!); Ghazvin: Ovan lake, 100 m, 25 Aug 2015, Naseri 20207 (HUI!); Kurdistan: Marivan, Zaribar lake, 1300 m, 15 July 2008, Dinarvand 8299 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Khorasan: Khaf, 1250 m, 20 July 2008, Dinarvand 21137 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Kermanshah: Gharehsoo lake, 1000 m, 7 June 2015, Abbasi & Afsharzadeh 20209 (HUI!); Hashilan wetland, 1320 m, 10 July 2010, Dinarvand 52316 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Khuzestan: Shush, Karkhe Naderi bridge, 100 m, 20 June 2008, Dinarvand 8104 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Dezful, Hamidabad, 140 m, 20 June 2008, Dinarvand 8340 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Khoramshahr, under bridge, 500 m, 20 June 2010, Dinarvand 8028 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!).