Potamogeton obtusifolius

Bluntleaf Pondweed

SPECIES

1. KingdomPlantae
2. PhylumTracheophyta
3. ClassLiliopsida
4. OrderAlismatales
5. FamilyPotamogetonaceae

Habitatfreshwater

Native toAlaska, Alberta, Altay, Amur, Austria, Baltic States, Belarus, Belgium, British Columbia, Buryatiya, Central European Russia, Chita

Observations293

Observations recorded31,519

Rhizomes absent. Cauline stems slightly compressed, without spots, 35--90 cm; glands yellow-green to gold, 0.2--1 mm diam. Turions terminal, abundant, 3.5--7.8 cm ´ 2.3--5.1 mm, soft; leaves ± 2-ranked; outer leaves 3--4 per side, base not corrugate, apex apiculate to obtuse; inner leaves undifferentiated. Leaves submersed, ± spirally arranged, sessile, flaccid; stipules persistent, inconspicuous, convolute, free from blade, white, not ligulate, 0.6--1.8 cm, fibrous, rarely shredding at tip, apex obtuse; blade light green to somewhat reddish, linear, not arcuate, 3--8.2 cm ´ 1--3.5 mm, base slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, obtuse or round-apiculate, lacunae in 1--3 rows each side of midrib; veins 3. Inflorescences unbranched, emersed; peduncles not dimorphic, axillary, erect, rarely recurved, cylindric, 0.8--1.9(--4.2) cm; spike not dimorphic, cylindric, 8--13 mm. Fruits sessile, olive-green to brown, obovoid, turgid, abaxially keeled or not, laterally keeled or not, 2.5--3.6 ´ 1.7--2.4 mm, lateral keels when present without points; beak erect, 0.8--1 mm; sides without basal tubercles; embryo with 1 full spiral.