The firestick plant (Euphorbia tirucalli) is a type of succulent (despite commonly called a cactus). 

It is also commonly known as pencil cactus, stick cactus, fire plant, pencil plant, and ‚¬Ëœsticks on fire.‚¬„¢ 

It has clumps of pencil like stems that have an orangered color that resembles the color of fire.

Easy to grow, it thrives in bright sunlight and warm temperatures.  As a succulent it enjoys low humidity.

The firestick cactus is an easy succulent to grow. The firestick plant thrives in bright sunlight, warm temperatures, and low humidity. Ensure the plant grows in well-draining soil. Only water the plant occasionally when the soil dries out.

The sap in the pencil cactus has a substance that is toxic to dogs and cats.  It also causes skin irritation in humans.  So be careful where you place it in your home or garden.