vascular plant · terminal bud · simple leaf · sea weed · sage brush · petrified wood · opposite leaves · lateral bud · lanceolate leaf · incomplete flower

Any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers.

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Branchlets opposite. Leaves opposite, exstipulate, veins 3-5, basifugal, margin entire or serrate.

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Lateral branches penetrating leaf sheaths. Leaves alternate. Inflorescences borne at each node, opposite leaves, emerging from mouth of leaf sheath, each a large panicle of numerous cincinni; cincinni each subtended by an involucral bract; bracts similar to leaves, becoming smaller toward apex of cincinnus.

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opposite decussate leaves：交互對生葉

opposite crank 對置曲柄 | opposite decussate leaves 交互對生葉 | opposite direction 反方向=>反対方向