没分别。
1.你要确定的话最好问老师，SPM skema 不一定跟网上的资料一样的。
2.中五生物课本用的术语(term)也只有eudicot,没有dicot。
3.Traditionally they were called tricolpates or non-magnoliid dicots by previous authors.(wikipedia)
4. The difference is dicots is an outdated term, because it was not a monophyletic group (as e.g. magnoliids or ginkgo also have 2 cotyledons). The eudicots are monophyletic as they exclude e.g. magnoliids by their "new" synapomorphy the tricolpate pollen. (reddit)
Actually there is a difference. The dicots also include e.g. magnoliids and the ANITA-grade and are therefore not monophyletic. Eudicots exclude them and are monophyletic.
