Thalia dealbata (Powdery thalia, Hardy canna, Powdery alligator-flag) is an aquatic plant in the family Marantaceae, native in several southern states of the United States, and into Missouri and Illinois. It grows to 6 ft (1.8 m), with small violet flowers on an 8 in (20 cm) panicle held above the foliage. The blue-green leaves are ovate to lanceolate, dusted with white powder and with purple edges.
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