From A Wiki in the Desert
Below is a working list of all the plants in Egypt which do not fall under the Herbs, Trees or Plants lists. Please feel free to add any more you find.
The Cactus is another category of plant. They do not generate Fresh Leaves, and cannot be foraged as herbs. Oddly, they also do not produce thorns.
- Royal Cactus will produce Cactus Sap
- Barrel Cactus and Old Hands Cactus seem to be purely decorative.