leaf lamina vein leaf vein secondary leaf vein secondary leaf vein FNA:dba43715-e71f-4192-87a2-489f5b9b4c82 cross-vein (narrow) 二次葉脈 (Japanese, exact) plant_anatomy Vein orders only apply to hierarchically branching vein patterns, not to dichotomously branching vein patterns, as found in some ferns and gymnosperms. A leaf lamina vein (PO:0020138) arising from a primary leaf vein (PO:0025413). veinlet (related) A leaf lamina vein (PO:0020138) arising from a primary leaf vein (PO:0025413). vena secundaria (Spanish, exact) PO_GIT:435 PO:0020140