<Li> A. altissima var . tanakai, which is endemic to northern Taiwan highlands . It differs from the type in having yellowish bark, odd - pinnate leaves that are also shorter on average at 45 to 60 cm (18 to 24 in) long with only 13--25 scythe - like leaflets . It is listed as endangered in the IUCN Red List of threatened species due to loss of habitat for building and industrial plantations . </Li> <Li> A. altissima var . sutchuenensis, which differs in having red branchlets . </Li> <P> A. altissima is native to northern and central China, Taiwan and northern Korea . In Taiwan it is present as var . takanai . In China it is native to every province except Gansu, Heilongjiang, Hainan, Jilin, Ningxia, Qinghai, Xinjiang, and Tibet . </P> <P> The tree prefers moist and loamy soils, but is adaptable to a very wide range of soil conditions and pH values . It is drought - hardy, but not tolerant of flooding . It also does not tolerate deep shade . In China it is often found in limestone - rich areas . The tree of heaven is found within a wide range of climatic conditions . In its native range it is found at high altitudes in Taiwan as well as lower ones in mainland China . In the U.S. it is found in arid regions bordering the Great Plains, very wet regions in the southern Appalachians, cold areas of the lower Rocky Mountains and throughout much of the California Central Valley . Prolonged cold and snow cover cause dieback, though the trees re-sprout from the roots . </P>

Where did the tree of heaven come from