中始式 [植] mesarch
- 上胚轴苗区具有内始式真中柱。
There was endarch eustele in epicotylary shoot zone. - 小叶片边缘木反卷,叶肉分化,具单脉,木质部发育为中始式,气孔为单环型。
The margins of pinna are not revolute. The pinna mesophyll is well differentiated with a single vein. - 在子叶节区下部存在原始的外始式二原型十字形单中柱。
The primitive exarch and diarch haplostele with cross-like metaxylem exists in the lower part of CNZ.
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