木质部外
木质部外-
星状中柱，初生木质部外始式，初生韧皮部呈孤岛状，呈径向辐射状排列位于初生木质部之间，中央形成微弱的髓。
It has Actinostele , primary xylem is exarch , primary phloem located between primary xylems like an island . The pith is shaped in the middle .
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蓝靛果忍冬初生木质部发育为外始式，根的初生结构为8原型。
Primary xy-lem is exarch , primary structure of root is 8 polyarch .
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智囊团的经济特质是显而易见的。结果表明：内皮层都具有凯氏带，幼根均具有明显的髓，初生木质部均为外始式四原型；
The economic feature is obvious . shows that of all types casparian strip exits in endodermis and evident pith does in young root ; primary xylem is exarch and tetrarch ;
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3龄幼虫咬一长椭圆形蛀入孔进入木质部，此后树皮外不再出现蛀屑。
3-instars bite a elongated oval boring hole to xylem , then the mixture disappear .