It sounds like you might be referring to plants like thistle or burdock, which have thorns on their leaves and stems to deter animals from eating them. These plants are considered weeds in many areas due to their invasive nature and ability to outcompete native vegetation.
The desert cactus
the stem
Leaves provide extra surface area for water to evaporate out of the plant. In the arid desert, plants need all the water they can get.
Thorns
Yes, Victoria Cruziana have thorns on the underside of their leaves and on their stems.
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The desert cactus
It's the thorns on cactus plants and roses that make them both difficult to hold. On both plants, the thorns serve to defend and protect the stem and the flower. But on the cactus, the thorn is a modified leaf. On a rose, the stem has both thorns and regular leaves.
they have poky thorns on their stem that protect them. =)
it has a stem that is green and has long thorns on it. sometimes the stem is long.
the stem
One can identify weed leaves by looking for leaves that are typically serrated, with a pointed tip and a distinct pattern of veins. They are usually arranged in an alternating pattern along the stem and have a strong, pungent odor when crushed.
Leaves provide extra surface area for water to evaporate out of the plant. In the arid desert, plants need all the water they can get.
A rose usually has thorns on it
Thorns.
Then it's not weed.
Thorns