太多的图例项目使其无法阅读

I have a SpatialPolygonsDataFrame with 213 Ecoregions to plot. My issue is that I'm not able to organize the legend in a way that I could indeed read the legend. I'm new to r and I've been trying this for 2 days now, I feel really stupid... I wonder if anyone could give me some hint on how to achieve this goal.I have a SpatialPolygonsDataFrame with 213 Ecor