葉序(粵拼:jip6 zeoi6)係樹葉嚮植物枝莖上面生長分佈次序。嚮植物學上面,葉序係分析辨認植物種類嘅一種途徑。最簡單嘅幾種葉序類型,包括對生,輪生、互生。
又叫做十字對生,葉片嚮莖節上兩片、兩片一排,一對對差唔多形成180度。咁生法有利光合作用。對生植物例如丁香、迷迭香、薄荷葉。
每莖節上只生一塊葉。成枝植物,葉序可能成為螺旋狀、二列狀或者三列狀。螺旋狀葉序植物例如樟樹科植物;二列狀植物例如鳶尾科植物;三列狀例如莎草科植物。
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