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Definition of Flower-of-an-hour
1. Noun. Annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; naturalized as a weed in North America.
Exact synonyms: Black-eyed Susan, Bladder Ketmia, Flowers-of-an-hour, Hibiscus Trionum
Generic synonyms: Hibiscus
Generic synonyms: Hibiscus