Noun:

1. tropical African climbing plant having yellow flowers with a dark purple center

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

3. the state flower of Maryland; of central and southeastern United States; having daisylike flowers with dark centers and yellow to orange rays

blackadj.黑的；不加牛奶的；很脏的；愤怒的；令人沮丧的；邪恶的；阴沉的；机密的；黑色幽默的n.黑色；黑人；黑色物v.抵制；(使)变黑black day凶日；黑色情人节