Synopsis of Potamogetonaceae in Iran with supplements to the Flora Iranica and a new identification key Author Abbasi, Shabnam * Department of Biology, Faculty of Science, University of Isfahan, P. O. Box 73441 - 81746, Isfahan, Iran Author Afsharzadeh, Saeed * Department of Biology, Faculty of Science, University of Isfahan, P. O. Box 73441 - 81746, Isfahan, Iran Author Dinarvand, Mehri Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Ahvaz, Iran Author Wiegleb, Gerhard Department of Ecology, BTU Cottbus-Senftenberg, Cottbus, Germany text Phytotaxa 2017 2017-06-23 311 1 1 21 http://dx.doi.org/10.11646/phytotaxa.311.1.1 journal article 10.11646/phytotaxa.311.1.1 1179-3163 13686054 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 !) .