柳树是杨柳科柳属的植物，总共有约520种，其中比较常见的有垂柳、旱柳、爆竹柳等。它并不高大，大多数品种为灌木，只有少数品种为乔木。它在我国很多的省份都有分布。在古代，有折断柳枝赠予即将远行的友人，来表达不舍与祝福的习俗。
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