You need to give a specific desert as each desert has a flora that is different from other deserts.
Bermuda grass
Shrub
spiraea
There is no antonym for shrub. Most common nouns don't have antonyms. Like table, yellow, window, elephant.
The hot subtropical desert is the most common type of deserts. They account for about 2/3 of the deserts on earth.
Antarctica
Desert
The most common producer in the desert are the grasses that are able to survive there.
the meerkat
Some of the most commonly seen and prominent plants in the Chihuahuan Desert are mesquite, creosote bush, yuccas and ocotillos.
everyone grows it
The most common desert form found in arid regions around the world is sand dunes.