annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; naturalized as a weed in North America
[ Syn: flower-of-an-hour , bladder ketmia , black-eyed susan , hibiscus trionum ]
annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; naturalized as a weed in North America
[ Syn: flower-of-an-hour , bladder ketmia , black-eyed susan , hibiscus trionum ]