芒果视频下载

形態及特征

常(chang)綠喬木或(huo)(huo)灌木；小枝不規則(ze)互生(sheng)(sheng)(sheng)，基(ji)(ji)部有(you)多數或(huo)(huo)少數宿存(cun)的(de)(de)(de)芽(ya)鱗，稀全部脫落；冬芽(ya)芽(ya)鱗覆(fu)瓦狀排(pai)列(lie)，背部縱(zong)脊明顯(xian)或(huo)(huo)不明顯(xian)。葉條形，螺旋狀著生(sheng)(sheng)(sheng)，基(ji)(ji)部扭轉排(pai)成(cheng)二列(lie)，直或(huo)(huo)鐮狀，下(xia)延生(sheng)(sheng)(sheng)長，上(shang)面(mian)中(zhong)脈隆(long)起，下(xia)面(mian)有(you)兩條淡灰色、灰綠色或(huo)(huo)淡黃色的(de)(de)(de)氣孔(kong)帶，葉內無(wu)樹脂道。雌雄(xiong)異株，球花單生(sheng)(sheng)(sheng)葉腋(ye)；雄(xiong)球花圓球形，有(you)梗(geng)(geng)，基(ji)(ji)部具覆(fu)瓦狀排(pai)列(lie)的(de)(de)(de)苞(bao)片(pian)，雄(xiong)蕊6-14枚，盾狀，花藥4-9,輻(fu)射排(pai)列(lie)；雌球花幾無(wu)梗(geng)(geng)，基(ji)(ji)部有(you)多數覆(fu)瓦狀排(pai)列(lie)的(de)(de)(de)苞(bao)片(pian)，上(shang)端2-3對苞(bao)片(pian)交叉對生(sheng)(sheng)(sheng)，胚(pei)珠(zhu)(zhu)直立，單生(sheng)(sheng)(sheng)于總花軸上(shang)部側生(sheng)(sheng)(sheng)短軸之(zhi)頂端的(de)(de)(de)苞(bao)腋(ye)，基(ji)(ji)部托(tuo)(tuo)以圓盤狀的(de)(de)(de)珠(zhu)(zhu)托(tuo)(tuo)，受精后珠(zhu)(zhu)托(tuo)(tuo)發(fa)育(yu)成(cheng)肉(rou)質(zhi)(zhi)、杯狀、紅(hong)(hong)色的(de)(de)(de)假(jia)種(zhong)(zhong)(zhong)皮(pi)。種(zhong)(zhong)(zhong)子(zi)(zi)堅(jian)果狀，當年成(cheng)熟(shu)，生(sheng)(sheng)(sheng)于杯狀肉(rou)質(zhi)(zhi)的(de)(de)(de)假(jia)種(zhong)(zhong)(zhong)皮(pi)中(zhong)，稀生(sheng)(sheng)(sheng)于近膜質(zhi)(zhi)盤狀的(de)(de)(de)種(zhong)(zhong)(zhong)托(tuo)(tuo)（即未發(fa)育(yu)成(cheng)肉(rou)質(zhi)(zhi)假(jia)種(zhong)(zhong)(zhong)皮(pi)的(de)(de)(de)珠(zhu)(zhu)托(tuo)(tuo)）之(zhi)上(shang)，種(zhong)(zhong)(zhong)臍明顯(xian)，成(cheng)熟(shu)時肉(rou)質(zhi)(zhi)假(jia)種(zhong)(zhong)(zhong)皮(pi)紅(hong)(hong)色，有(you)短梗(geng)(geng)或(huo)(huo)幾無(wu)梗(geng)(geng)；子(zi)(zi)葉2枚，發(fa)芽(ya)時出土。

價值及其他

主要用途

本屬木材(cai)(cai)的邊材(cai)(cai)窄(zhai)，與心材(cai)(cai)區別明顯，無(wu)樹(shu)脂(zhi)(zhi)道及樹(shu)脂(zhi)(zhi)細胞，紋理(li)均(jun)勻(yun)，結構細致(zhi)，硬度大，防(fang)腐(fu)力強，韌性強。為(wei)優良的建筑(zhu)、橋(qiao)梁、家(jia)具、器材(cai)(cai)等用材(cai)(cai)。惟(wei)產(chan)量少，一般僅作細木加工、船槳(jiang)、拱(gong)形制品、車旋(xuan)、雕(diao)刻、樂器及箱(xiang)板等用；種(zhong)子可(ke)(ke)榨油。葉常綠，深綠色，假種(zhong)皮肉質紅色，頗為(wei)美觀，可(ke)(ke)作庭園樹(shu)。本屬樹(shu)種(zhong)耐蔭(yin)性強，在(zai)天然林中(zhong)生(sheng)(sheng)長緩慢，分布星散，野生(sheng)(sheng)樹(shu)木日漸減(jian)少。惟(wei)木材(cai)(cai)優良，宜選用造(zao)林，加強撫育管(guan)理(li)，可(ke)(ke)促進其加速生(sheng)(sheng)長，以生(sheng)(sheng)產(chan)優良木材(cai)(cai)。