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城口杜仲

城口杜仲 

杜仲,落葉喬木,高達(dá)15~20米,胸徑約50厘米。樹皮有粗或細(xì)裂紋。枝、根、皮、葉均含硬橡膠。葉側(cè)脈和網(wǎng)脈正面下凹而背面凸出,雌雄異株。無(wú)花被。翅果扁平長(zhǎng)橢圓形。中國(guó)特有單種科植物。分布于長(zhǎng)江中部各地,生于海拔300~2500米處的溫涼、濕潤(rùn)而陽(yáng)光較充足的生境中。在新生代時(shí)曾分布于北美和歐洲。具有極高的經(jīng)濟(jì)價(jià)值,但野生資源已破壞殆盡。國(guó)家二級(jí)保護(hù)稀有種。城口人工栽植杜仲有較長(zhǎng)的歷史,目前在全縣各地均有分布。

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