| flower-of-an-hour | (n) annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; naturalized as a weed in North America, Syn. Hibiscus trionum, flowers-of-an-hour, bladder ketmia, black-eyed Susan |
| flowers-of-an-hour | n. An annual weedy herb (Hibiscus trionum) with ephemeral yellow purple-eyed flowers, native to the Old World tropics and naturalized as a weed in North America. |