A native to tropical Asia, air potato, Dioscorea bulbifera, was introduced into the Americas from Africa, where it is naturalized, and in 1905, introduced into Florida. It forms unique or novel habitats by forming dense canopies over native tree communities, causing them to become degraded and diminished. It was placed on the Florida Noxious Weed List by the Florida Department of Agriculture and Consumer Services in 1999.
Giant salvinia is an aquatic fern prohibited in the United States by Federal law.
leaves
Leaf surfaces have rows of cylindrical hairs topped with four branches that are joined at the tips to form a "cage" (view with hand lens). These hairs give a velvety appearance and repel water. Distinguish from common salvinia, Salvinia minima, which has leaf hairs with branches always free at the tips.
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