Groenlandia densa

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 : 17-18

Groenlandia densa (L.) Fourreau (1869: 169), Fig. 19

Potamogeton densus Linnaeus (1753: 126)

Perennial, rhizome filiform, stem slender to filiform. Leaves monomorphic; submersed leaves 10–25 mm long, 4–10 mm wide, 3–7 veined, clasping at base, sessile, margins minutely serrate especially at apex. Inflorescence elongated with low number of flowers, peduncles 10–15 mm long, as thick as the stem. Tepals brown and membranaceous, anthers 1 mm long. Carpels 4, fruits drupaceous, 3-4 mm long, beak 2 mm long. Stele of circular type, endodermis of O-type, subepidermal and interlacunar bundles absent.

Worldwide distribution: —Europe, W Asia ( Turkey).

Distribution in Iran: —Northwest.

Flowering time: —From spring to summer. Specimen examined:— IRAN. Azerbaijan: Uromieh, Ghasemloo, 1700 m, 20 July 2010, Sabeti 7884 (TARI!),

Targovar region, Shahidchai river, 1400 m, 22 July 2009, Izadpanah & Taheri 68290 (TARI!), Talatapeh road to

Uromieh, Yogonabad, 1990 m, 22 July 2009, Izadpanah & Taheri 68330 (TARI!).

Figures

FIGURE 19. G. densa a. cross section of stem (Scale bar: 100 μm, objective lens 4), b. morphological shape.