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1、美国白蜡种名及分布图http://plants.usda.gov/java/profile?symbol=FRAXI序号拉丁名称英文名称1Fraxinusanomalasingleleafash2FraxinusberlandierianaMexicanash3FraxinuscarolinianaCarolinaash4FraxinuschinensisChineseash5Fraxinuscuspidatafragrantash6FraxinusdipetalaCaliforniaash7FraxinusexcelsiorEuropeanash8Fraxinusgo
2、oddingiiGoodding'sash9FraxinusgreggiiGregg'sash10FraxinuslatifoliaOregonash11FraxinusmandshuricaManchurianash12FraxinusmariesiiMaries'ash13Fraxinusnigrablackash14Fraxinusornusfloweringash15FraxinuspapillosaChihuahuanash16Fraxinuspennsylvanicagreenash17Fraxinusprofundapumpkinash18Fraxinus
3、quadrangulatablueash19FraxinustexensisTexasash20Fraxinusuhdeishamelash21Fraxinusvelutinavelvetash树种介绍一、FraxinusamericanaWhiteAshFEATURESFormlargeshadetreeusuallymaturingatabout70'tallby70'wide,butcanbecomemuchlargeruprightovalgrowthhabitinyouth,quicklymaturingtoaroundedgrowthhabitwithout
4、acentralleadermediumtorapidgrowthrateCulturefullsuntopartialsunprefersmoist,well-drained,deep,slightlyacidicsoilsinfullsun,andissomewhatadaptabletovarioussoilsandsoilpHs,butoverallitisnotoverlyurbantolerant(especiallytosoilcompactionanddrought),especiallywhencomparedtoGreenAshcultivarsar
5、epropagatedprimarilybycuttingsgraftedontoseedlingrootstock,whilethespeciesformiseasilypropagatedbyseedsOliveFamily,withseveralnoteworthydiseases(leafanthracnose,leafspots,branchcankers,mycoplasma-induceddeclineanddieback)andpests(ashborer,oystershellscale)abundantlyavailableinballandburl
6、apformFoliageoppositeleavesarepinnatelycompound,to15"longoverall,mediumtodarkgreenontheuppersidesoftheleaflets,andsilvery-whitetolightgreenunderneath,castingadenseshadeandaslightlybicoloreffectinthebreezeleaflets(usuallyseven,butcanbefiveornine)areovate(widerthanGreenAsh)andusuallyentire
7、onthemarginsrachisisstoutandenlargedatitsbase,leavingaprominentcrescentmoon-shaped(U-shaped)leafscaruponabscissionfallcolorisoftenaprogressionfromvividyellowtoorange,maroon,red,andfinallyburgandyorpurple,usuallybeginninginlateSeptemberandcompletelyabscisedbymid-October(so
