七葉(xie)樹(shu)是落葉(xie)喬木，高(gao)達25米(mi)，樹(shu)皮深(shen)褐(he)色(se)(se)(se)或灰(hui)褐(he)色(se)(se)(se)，小枝(zhi)、圓(yuan)(yuan)柱形(xing)(xing)(xing)(xing)，黃(huang)褐(he)色(se)(se)(se)或灰(hui)褐(he)色(se)(se)(se)，無(wu)毛或嫩時有微(wei)柔(rou)毛，有圓(yuan)(yuan)形(xing)(xing)(xing)(xing)或橢(tuo)圓(yuan)(yuan)形(xing)(xing)(xing)(xing)淡黃(huang)色(se)(se)(se)的(de)(de)皮孔。冬芽大形(xing)(xing)(xing)(xing)，有樹(shu)脂。掌狀復葉(xie)，由5-7小組成，葉(xie)柄長(chang)(chang)(chang)(chang)10-12厘(li)米(mi)，有灰(hui)色(se)(se)(se)微(wei)柔(rou)毛；小葉(xie)紙質(zhi)，長(chang)(chang)(chang)(chang)圓(yuan)(yuan)披(pi)針形(xing)(xing)(xing)(xing)至長(chang)(chang)(chang)(chang)圓(yuan)(yuan)倒披(pi)針形(xing)(xing)(xing)(xing)，稀長(chang)(chang)(chang)(chang)橢(tuo)圓(yuan)(yuan)形(xing)(xing)(xing)(xing)鉀先端(duan)短銳尖，基(ji)(ji)部(bu)(bu)楔形(xing)(xing)(xing)(xing)或闊楔形(xing)(xing)(xing)(xing)，邊(bian)緣有鈍尖形(xing)(xing)(xing)(xing)的(de)(de)細(xi)鋸齒，長(chang)(chang)(chang)(chang)8-16厘(li)米(mi)，寬3-5厘(li)米(mi)，上(shang)(shang)面(mian)(mian)(mian)深(shen)綠色(se)(se)(se)，無(wu)毛，下(xia)面(mian)(mian)(mian)除中(zhong)肋及側(ce)脈的(de)(de)基(ji)(ji)部(bu)(bu)嫩時有疏(shu)柔(rou)毛外，其余部(bu)(bu)分無(wu)毛；中(zhong)肋在(zai)上(shang)(shang)面(mian)(mian)(mian)顯(xian)(xian)著(zhu)(zhu)，在(zai)下(xia)面(mian)(mian)(mian)凸起，側(ce)脈13-17對，在(zai)上(shang)(shang)面(mian)(mian)(mian)微(wei)顯(xian)(xian)著(zhu)(zhu)，在(zai)下(xia)面(mian)(mian)(mian)顯(xian)(xian)著(zhu)(zhu)；中(zhong)央小葉(xie)的(de)(de)小葉(xie)柄長(chang)(chang)(chang)(chang)1-1.8厘(li)米(mi)，兩側(ce)的(de)(de)小葉(xie)柄長(chang)(chang)(chang)(chang)5-10毫米(mi)，有灰(hui)色(se)(se)(se)微(wei)柔(rou)毛。
花(hua)(hua)(hua)(hua)(hua)序(xu)圓(yuan)筒形(xing)(xing)(xing)(xing)，連同長(chang)(chang)5-10厘米(mi)(mi)的總花(hua)(hua)(hua)(hua)(hua)梗在(zai)內共長(chang)(chang)21-2 5厘米(mi)(mi)，花(hua)(hua)(hua)(hua)(hua)序(xu)總軸有(you)(you)微(wei)柔毛(mao)(mao)，小花(hua)(hua)(hua)(hua)(hua)序(xu)常由5-10朵花(hua)(hua)(hua)(hua)(hua).組成，平斜向(xiang)伸展，有(you)(you)微(wei)柔毛(mao)(mao)，長(chang)(chang)2-2.5厘米(mi)(mi)，花(hua)(hua)(hua)(hua)(hua)梗長(chang)(chang)2-4毫(hao)(hao)米(mi)(mi)。花(hua)(hua)(hua)(hua)(hua)雜性(xing)，雄(xiong)花(hua)(hua)(hua)(hua)(hua)與兩性(xing)花(hua)(hua)(hua)(hua)(hua)同株，花(hua)(hua)(hua)(hua)(hua)萼管狀鐘形(xing)(xing)(xing)(xing)，長(chang)(chang)3-5毫(hao)(hao)米(mi)(mi)，外面有(you)(you)微(wei)柔毛(mao)(mao)，不等地5裂(lie)，裂(lie)片鈍形(xing)(xing)(xing)(xing)，邊(bian)緣(yuan)有(you)(you)短纖(xian)毛(mao)(mao)；花(hua)(hua)(hua)(hua)(hua)瓣4，白色，長(chang)(chang)圓(yuan)倒(dao)卵(luan)形(xing)(xing)(xing)(xing)至(zhi)長(chang)(chang)圓(yuan)倒(dao)披(pi)針形(xing)(xing)(xing)(xing)，長(chang)(chang)約8-12毫(hao)(hao)米(mi)(mi)，寬5-1.5毫(hao)(hao)米(mi)(mi)，邊(bian)緣(yuan)有(you)(you)纖(xian)毛(mao)(mao)，基部爪狀；雄(xiong)蕊6，長(chang)(chang)1.8-3厘米(mi)(mi)，花(hua)(hua)(hua)(hua)(hua)絲線狀，無毛(mao)(mao)，花(hua)(hua)(hua)(hua)(hua)藥(yao)長(chang)(chang)圓(yuan)形(xing)(xing)(xing)(xing)，淡黃(huang)色，長(chang)(chang)約1-1.5毫(hao)(hao)米(mi)(mi)；子房在(zai)雄(xiong)花(hua)(hua)(hua)(hua)(hua)中(zhong)不發育，在(zai)兩性(xing)花(hua)(hua)(hua)(hua)(hua)中(zhong)發育良好(hao)，卵(luan)圓(yuan)形(xing)(xing)(xing)(xing)，花(hua)(hua)(hua)(hua)(hua)柱無毛(mao)(mao)。
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