Re: native North American aroids
According to Deni Bown's book, Orontium aquaticum comes from eastern North
America, called the Golden Club. This is aquatic though.
Semi-aquatic Lysichiton americanus, Skunk Cabbage,from western North America
from Alaska to Calif.
Symplocarpus foetidus, Eastern Skunk Cabbage, Collard, Meadow Cabbage,
Polecate Weed, and Swamp Cabbage; from eastern North Am.
Peltandra virginica, Arrow Arum, eastern North Am. Two other species.
This is all I could find, hope it helps.