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American Pillwort
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Calamistrum americanum, Pilularia caroliniana, Pilularia mandonii, Calamistrum mandonii, Pilularia valdiviana
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Polypodiopsida
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Salviniales
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Marsileaceae
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USA (Alabama, Arkansas, California, Georgia, Kansas, Missouri, Nebraska, North Carolina, Oklahoma, Oregon, South Carolina, Tennessee, Texas), Chile, Venezuela, Colombia, Bolivia, S-Brazil (Rio Grande do Sul), Argentina (Corrientes), Mexico (Baja California)
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ja
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