Aquarius palifolius, synonyms including Echinodorus palifolius, also known as Mexican sword plant is an emerged aquatic plant in the Alismataceae. It has a rather odd, discontinuous range, native to Brazil (Minas Gerais and Bahia), Peru, Uruguay, and Mexico (Nayarit). It has been introduced in many countries including Bangladesh and India.

The specific epithet is sometimes spelled palaefolius. The correct spelling is palifolius per ICN 60G.1.

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