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Plants in the Wild

Can You Answer This Riddle?

From Oregon to Maryland, coast to coast, with stops along the highways of the midwest, it's now electrifying roadsides, brightening streams and illuminating woodlands. Though it sings the same notes first introduced by the daffodils of spring, it's the last brash wildflower of the year. Last hint, its botanic name rhymes with How'd Your Day Go.

The answer is?