常綠喬木,樹皮為深灰色或赤褐色,幼樹枝條常斜上伸展,樹冠尖塔形,老樹大枝平展,樹冠寬卵球形。葉二形,刺針葉生於幼樹,老樹為鱗葉,壯齡樹二者都有;刺葉常為三枚輪生或交互對生,窄披針形,先端銳尖成刺,基部下延生長,上面有兩條白粉帶;鱗葉菱卵形,交互對生或三葉輪生,排列緊密。球花單性,常為雌雄異株,花期為4月,毬果在第二年成熟。毬果近球形,有白粉,含種子數粒。
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