The P-T extinction might not have had much effect on land plants

[Halichoeres]

Evidence for the severity of the P-T extinction on land vertebrates and marine animals of all kinds is very strong, but this paper makes the case that indications of extinction across the boundary among land plants is mostly just sampling bias (in other words, people hadn't looked at enough fossil pollen grains in the Early Triassic, which led them to assume more things had gone extinct than actually had.

This series of plots shows how many species have been found on various time intervals before and after the P-T after this study. 


Paper (I can read it but it might be institutional access; if you want a pdf you know what to do): https://www.nature.com/articles/s41467-018-07945-w.epdf