Medicinal plants grow in the desert in small numbers and at certain times of the year when conditions are favorable
These plants store water in some of their parts to cope with drought, so mutations occurred in these parts to suit the function
Formation of stems and succulent leaves to store the largest amount of water
The leaves are small in size to reduce the amount of transpiration
The leaves and stem are covered with a layer of chitin to reduce water loss
Leaves and stem are either light colored or mottled green to reduce light absorption
The stomata are few in number and close during the intensification of heat. They may be covered with waxes and resin and are sunken under the epidermis
The concentration of cellular juice in the root hairs is high to facilitate the absorption of water from the soil
The branches are short and close to each other in the form of a small cushion, which protects the plant from direct sunlight
Placing the leaves on the stem is vertical and parallel to the stem, as well as the blade is small and the neck is flattened
The leaves may be completely absent and the stems are flattened and replace them in the post
The plant stores water in special tissues in the middle and away from sunlight to prevent water loss
The roots are deep and extended in the soil to reach groundwater
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