Botanical name: Potamogeton crispus    Family: Potamogetonaceae (Pondweed family)
Synonyms: Potamogeton rubricans, Potamogeton serrulatus, Potamogeton tuberosus

Curled Pondweed is is a rhizome forming perennial herb producing a flattened, branching stem up to a meter long. The leaves are linear or oblong in shape. Only submerged leaves are produced, which are stalkless, linear or oblong in shape, 2.5-10 cm long and 0.5-1.2 cm wide. The leaves may be bright green, olive green or (especially later in the season) brownish and have noticeably sawtoothed margins, a feature that distinguishes them from other pondweeds. The leaves usually have wavy edges but this is not always apparent, especially on new growth. Turions (wintering buds) occur in leaf axils and at stem tips. The inflorescence is a short spike of flowers emerging above the water surface. The turions of the plant develop along with the fruits and germinate, leaving the newly sprouted plants to overwinter. Curled Pondweed is native to a wide range of countries in Asia, Africa, Europe and Australia, at altitudes of 600-2000 m.

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The flower labeled Curled Pondweed is ...