The plant genus that dominated glaciated regions during the late Paleozoic and early Mesozoic was Glossopteris.

* Glossopteris was a genus of seed ferns that flourished during the Permian period, a time marked by extensive glaciation. They were adapted to cold, harsh climates and were widely distributed in the Southern Hemisphere, including areas that are now parts of South America, Africa, India, Australia, and Antarctica.

* Other plants were also present, but Glossopteris was the most dominant and characteristic plant genus of the time.