Potamogeton nodosus Poiret 1816
Creators: name: Abbasi, Shabnam
name: Afsharzadeh, Saeed
name: Dinarvand, Mehri
name: Wiegleb, Gerhard
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Alismatales
Potamogetonaceae
Potamogeton
Potamogeton nodosus

description: Potamogeton nodosus Poiret (1816: 535), Fig. 10   
Perennial, rhizome slender to robust, stem robust, terete. Leaves dimorphic; submersed leaves short to longly petiolate, in mature state often missing, 40–300 mm long, 11–30 mm wide, obtuse to acute at apex, cuneate at base, 7-veined; floating leaves 30–100 mm long, 11–50 mm wide, 20-veined, obtuse to acute at apex, petiole 70–200 mm long, stipules not fused, 30–75 mm long, membranaceous. Spike 15–55 mm long, peduncle 45–105 mm long, thicker than the stem. Tepals 1 mm long, anthers 1 mm long. Carpels 4, fruits 2.5–4 mm long, brownish to reddish. Stele of trio to 8 bundles type, endodermis of O-type, interlacunar bundles absent, subepidermal bundles absent.  
 This species is distinguished from morphologically similar P. natans Linnaeus (1753:126) by the lacking joint between petiole and lamina of the floating leaves.   
 Worldwide distribution: —Subcosmopolitan; Europe, Africa, W Asia (Afghanistan, Pakistan, Iraq), temperate and tropical Asia, Australia, Pacific islands, North America, N and C South America.   
 Distribution in Iran: —North, Northwest, West, Central, Northeast, South.   
 Flowering time: —From winter to autumn.   
 Specimen examined:— IRAN. Mazandaran: Siahrood, 62 m, 12 Aug 2014, Abbasi & Afsharzadeh 20193 (HUI!); Sorkhrood, 60 m, 29Aug 2015, Abbasi & Afsharzadeh 20195; Tajan, Abbasi & Afsharzadeh 20194 (HUI!); Gilan: under Sefidrood bridge, - 2 m, 16 July 2014, Abbasi & Afsharzadeh 8212 (HUI!); Isfahan: Dizicheh, 1692 m, 26 Sep 2014, Abbasi & Afsharzadeh 20196 (HUI!); Chamaseman dam, 1750 m, 1 Aug 2013, Abbasi & Afsharzadeh 20222 (HUI!); Lorestan: Pole Dokhtar, Lefone wetland, 1800 m, 12 July 2010, Dinarvand 8710 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Kurdistan: 78 km Pveh to Kermanshah, 1380 m, 15 July 2010, Dinarvand 27469 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Hamedan: Ghooshtapeh, 1850 m, 22 May 2008, Dinarvand 65017 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Kermanshah: West Gilan, 1000 m, 15 July 2010, Dinarvand 33920 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Ilam: under Simreh bridge, 100 m, 7 July 2010, Dinarvand 8285 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Kokiloye and Boyer Ahmad: 15 km to Yasouj, 2120 m, 7 June 2010, Dinarvand 8658 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Fars: Tjunction of Kamfirooz, 1630 m, 8 June 2010, Dinarvand 8673 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Khorasan: Hizomi spring, 1000 m, 10 July 2010, Dinarvand 5117 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Semnan: Ahmadabad Touran protected area, 1080 m, 1 September 1976, Freitag 14179 (TARI!); Kerman: Golbaf, 1727 m, 24 July 2014, Abbasi & Afsharzadeh 20191 (HUI!), Sistan va Baluchestan: Chabahar to Negor, river, 20 m, 25 May 2016, Abbasi & Afsharzadeh 20198 (HUI!); Khuzestan: Shushtar, 127 m, 27 June 2014, Abbasi & Afsharzadeh 20189 (HUI!); Izeh to Lordegan road, 1307 m, 27 June 2014, Abbasi & Afsharzadeh 20190 (HUI!); Ahvaz to Shushtar, after Arab Asad village, 100 m, 21 June 2010, Dinarvand 8143 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Karoon river, 20 m, 20 June 2010, Dinarvand 8341 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!); Dezful: Hamid Abad, 120 m, 20 June 2010, Dinarvand 8341 (Herbarium of the Research Center of Agriculture & Natural Resources of Khuzestan!).
description: Published as part of Abbasi, Shabnam, Afsharzadeh, Saeed, Dinarvand, Mehri & Wiegleb, Gerhard, 2017, Synopsis of Potamogetonaceae in Iran with supplements to the Flora Iranica and a new identification key, pp. 1-21 in Phytotaxa 311 (1) on page 10, DOI: 10.11646/phytotaxa.311.1.1, http://zenodo.org/record/13686054