维管束间距
interval between vascular bundles
包围维管束
concentric vascular bundle
并立维管束
collateral vascular bundle
collateral bundle
并生维管束
collateral vascular bundle
collateral bundle
垂直维管束柔细胞
Longitudinal strand parenchyma
大维管束效率
Large vascular bundles efficiency
复并立维管束
dicollateral bundle
dicollateral vascular bundle