Their leaves are either needle like or reduced to spines so as to reduce water loss by evaporation. The function of the leaf is taken up by the stem which has cells containing chloroplasts to absorb light and also lenticels to absorb gases.
By Mr. X Y
cactus
Cactus
Cactus
nothing happens
Minnesota has no true deserts.
cactus
cactus
The plant that needs little water and grows well in Arizona's deserts is the desert-adapted succulent called the agave. Agave plants are drought-tolerant and thrive in the arid conditions of the desert. They store water in their thick leaves, allowing them to withstand long periods of dryness.
a desert plant with thorns but withouth leaves
It is a desert plant that grows only in April to June. :p
no
Water lily - example Nymphae
helps it grow taller and grows leaves