Description
Emerse leaves erect, long-petioled, 80-120 cm long. Blade ovate, at the tip shortly acuminate, at the base abrupt, or regularly oval, at the tip blunt or incised, 15 - 26 cm x 7 - 15 cm wide with 7 - 13 veins and distinct pellucid lines. Submersed leaves on short petioles, blades oval or ovate, on both ends acuminate or blunt. This species has two forms.
Stem erect, 90 - 150 cm long, sparse and inconspicuously warted, infloresence paniculate, broadly branched in the lower whorl, having 5 - 12 whorls containing 6 - 12 flowers each. Bracts shorter or longer than the pedicels. Pedicels 1 - 2.5 cm long, sepals broadly ovate, ribbed, 4 - 6 mm long, petals white, corolla 3 - 4 cm in diameter. Stamens usually 24. Aggregate fruit globular, shortly echinate, achenes compressed, 3 mm long x 1 mm wide, having 3 - 5 ribs and 3 glands placed usually in one row, beak 0.4 - 0.5 mm long.
Veins are often dark reddish-brown and the blade may have reddish-brown irregular spots.
Read more about this topic: Echinodorus Argentinensis
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