Ageratum
[,ædʒә'reitәm]
解释:
(noun.) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers.
戴夫校对--From WordNet
解释:
(n.) A genus of plants, one species of which (A. Mexicanum) has lavender-blue flowers in dense clusters.
整理:罗伯塔