Deserts and semi-deserts represent vast open spaces with sandy, pebbly, or clayey soil. The main distinctive feature of these corners of the Earth is the extremely low amount of annual precipitation (rain) and high temperatures. During the day, the temperature can change significantly. In the deserts, unbearable heat (above +50°C) can prevail during the day, and at night there can be frosts (the temperature drops below 0°C). There can also be significant temperature changes throughout the year. In semi-deserts, temperature changes are not as drastic, and the level of precipitation is higher.

Extreme conditions leave a significant mark on local flora. Vegetation in semi-deserts is usually sparse, and in deserts, it can almost completely absent. Plants that reproduce by spores, such as ferns, are unable to survive in such a harsh climate. Therefore, in Jurassic deserts and semi-deserts, you could mainly find gymnosperms – conifers, for example, Pararaucaria, cycads, Bennettitales, suc...