1. black-eyed susan, bladder ketmia, flower-of-an-hour, flowers-of-an-hour, hibiscus trionum

annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; naturalized as a weed in North America

Synonyms

• black-eyed susan
• bladder ketmia
• flower-of-an-hour
• flowers-of-an-hour