·Xanthium............ (苍耳属)
       ·Xanthoceras......... (文冠果属)
       ·Xanthopappus........ (黄缨菊属)
       ·Xanthophyllum....... (黄叶树属)
       ·Xanthophytum........ (岩黄树属)
       ·Xantolis............ (刺榄属)
       ·Xerospermum......... (干果木属)
       ·Ximenia............. (海檀木属)
       ·Xylocarpus.......... (木果楝属)
       ·Xylopia............. (木瓣树属)
       ·Xylosma............. (柞木属)
       ·Xyris............... (黄眼草属)
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