Potamogeton trichoides Chamisso & Schlechtendal (1827: 175)

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, Phytotaxa 311 (1), pp. 1-21 : 6

Potamogeton trichoides Chamisso & Schlechtendal (1827: 175) , Fig. 5

Annual, rhizome filiform, stem filiform, terete. Leaves monomorphic; submersed leaves sessile, 14–80 mm long, 0.3–1 mm wide, gradually tapering to an acute apex, cuneate at base, 1(–3)-veined with one prominent midrib, side veins ending far before apex; floating leaves absent; stipules 3 mm long, not fused, membranaceous. Spike 1–3 mm long, peduncle 7–9 mm long; as thick as the stem. Tepals 1 mm long, anthers 1 mm long. Carpels 1, fruit 2 mm long. Stele of circular type, endoderm of O-type, interlacunar bundles absent, subepidermal bundles present.

This species is distinguished from morphologically similar species P. pusillus Linnaeus (1753: 127) and P. berchtoldii Fieber (1838: 277) by the presence of only one carpel.

Worldwide distribution:—Europe, N, E and S Africa, W Asia ( Turkey), SW and C Asia.

Distribution in Iran:—West.

Flowering time: —Flowering in summer.

Specimen examined:— IRAN. Azerbaijan: Ardebil to Khalkhal, 22 km SE of Budalalou, Neor lake, 1450 m, 20 July 2010, Zehzad, Jamzad, Taheri & Izadpanah 70520 (TARI!).

Figures

FIGURE 5. P. trichoides a. cross section of stem (Scale bar: 100 μm, objective lens 4), b. morphological shape.