方没有类似根冠的帽状结构；茎尖生长锥的四周表面能向外形成小突起，成为叶原基（leaf primordium）和腋 芽原基 （ bud primordium ），以后分别发育为叶和腋芽，腋芽再发育成枝。
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The promeristem in the shoot apex consists of tunica, corpus and leaf primordium.
苗端的原分生组织由原套、原体和叶原基组成。
The top of tumour-body formed shoot apex from bud primordium, and differentiated growing point, leaf primordium. young leaf and axillary bud primordium.
瘤状体顶端由芽原基形成苗端，分化出生长点、原基、叶和腋芽原基。
Leaf buttress a leaf primordium, appearing as a protuberance on the side of the stem apex, produced by periclinal division of the tunica and corpus, and associated with a procambium.
顶端分生组织上的侧生突起发育成叶的原基，与原形成层有关。
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