喬木，高可達15米，多具有圓形樹冠和短主干；小枝短而粗，圓(yuan)(yuan)柱形(xing)(xing)(xing)，幼(you)嫩(nen)(nen)時密被(bei)絨毛(mao)(mao)(mao)(mao)，老枝(zhi)紫褐色，無(wu)毛(mao)(mao)(mao)(mao)；冬芽卵(luan)(luan)形(xing)(xing)(xing)，先(xian)端(duan)(duan)鈍，密被(bei)短(duan)(duan)(duan)柔毛(mao)(mao)(mao)(mao)。葉(xie)片橢圓(yuan)(yuan)形(xing)(xing)(xing)、卵(luan)(luan)形(xing)(xing)(xing)至(zhi)寬(kuan)橢圓(yuan)(yuan)形(xing)(xing)(xing)，長4.5-10厘(li)米，寬(kuan)3-5.5厘(li)米，先(xian)端(duan)(duan)急尖，基部(bu)(bu)(bu)寬(kuan)楔形(xing)(xing)(xing)或圓(yuan)(yuan)形(xing)(xing)(xing)，邊(bian)緣(yuan)(yuan)具有(you)圓(yuan)(yuan)鈍鋸齒，幼(you)嫩(nen)(nen)時兩面(mian)(mian)(mian)具短(duan)(duan)(duan)柔毛(mao)(mao)(mao)(mao)，長成后上面(mian)(mian)(mian)無(wu)毛(mao)(mao)(mao)(mao)；葉(xie)柄(bing)粗壯，長約1.5-3厘(li)米，被(bei)短(duan)(duan)(duan)柔毛(mao)(mao)(mao)(mao)；托葉(xie)草(cao)質，披針形(xing)(xing)(xing)，先(xian)端(duan)(duan)漸(jian)尖，全(quan)(quan)緣(yuan)(yuan)，密被(bei)短(duan)(duan)(duan)柔毛(mao)(mao)(mao)(mao)，早(zao)落。傘房花(hua)序，具花(hua)3-7朵(duo)，集(ji)生于小枝(zhi)頂端(duan)(duan)，花(hua)梗長1-2.5厘(li)米，密被(bei)絨毛(mao)(mao)(mao)(mao)；苞片膜質，線狀披針形(xing)(xing)(xing)，先(xian)端(duan)(duan)漸(jian)尖，全(quan)(quan)緣(yuan)(yuan)，被(bei)絨毛(mao)(mao)(mao)(mao)；花(hua)直徑(jing)3-4厘(li)米；萼(e)筒(tong)外(wai)(wai)面(mian)(mian)(mian)密被(bei)絨毛(mao)(mao)(mao)(mao)；萼(e)片三角披針形(xing)(xing)(xing)或三角卵(luan)(luan)形(xing)(xing)(xing)，長6-8毫米，先(xian)端(duan)(duan)漸(jian)尖，全(quan)(quan)緣(yuan)(yuan)，內外(wai)(wai)兩面(mian)(mian)(mian)均密被(bei)絨毛(mao)(mao)(mao)(mao)，萼(e)片比萼(e)筒(tong)長；花(hua)瓣(ban)倒卵(luan)(luan)形(xing)(xing)(xing)，長15-18毫米，基部(bu)(bu)(bu)具短(duan)(duan)(duan)爪，白色，含(han)苞未(wei)放時帶粉紅色；雄蕊20，花(hua)絲長短(duan)(duan)(duan)不齊，約等(deng)于花(hua)瓣(ban)之半；花(hua)柱5，下(xia)半部(bu)(bu)(bu)密被(bei)灰白色絨毛(mao)(mao)(mao)(mao)，較雄蕊稍長。果(guo)實扁(bian)球形(xing)(xing)(xing)，直徑(jing)在2厘(li)米以上，先(xian)端(duan)(duan)常有(you)隆(long)起(qi)，萼(e)洼下(xia)陷(xian)，萼(e)片永存，果(guo)梗短(duan)(duan)(duan)粗。花(hua)期(qi)5月，果(guo)期(qi)7-10月。
