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乌桕的乳汁管是由顶端分生组织产生并且是无节的,在茎内的乳汁管是不分枝的,而在叶片中的可以形成分枝。 乌桕乳汁管仅产生于当年生的幼枝近上端和叶片以及花序轴和幼果柄内。随着叶面积的增加,乳汁量也相应加多,以后随着叶片的逐渐老化,其乳汁量也相应减少,最后停止分泌乳汁。当花序轴分化形成花的过程中,乳汁则在轴中形成,这时在茎中乳汁减少。雌蕊受精后果柄生长,乳汁则出现在果柄中。如果有的当年生枝顶端不产生花序,那么乳汁可一直保持在枝的上端产生,直到叶枯黄为止。
The larvae of the milk tube are produced by apical meristems and are nodose, the lacunas in the stems being unbranched, while branches in the leaves may form. Urumqi latex tube is only produced in the annual young branches near the top and leaves and inflorescence axis and young fruit stalk. With the increase of leaf area, the amount of milk also increased accordingly. As the leaves gradually aged, the amount of milk decreased correspondingly, and finally the secretion of milk was stopped. As the inflorescences differentiate to form flowers, the milk is formed in the shaft where milk is reduced in the stems. Pistil fertilization flesh growth, milk appears in the stalk. If the top of the branches did not produce inflorescences in those days, the milk could stay on the top of the branches until the leaves turn yellow.