Euphorbia tirucalli 'Sticks on Fire' is a succulent plant species that belongs to the family Euphorbiaceae. It is a shrub or small tree that can grow up to 20 feet (6 meters) tall in the wild. The stems are green and turn bright red-orange when exposed to direct sunlight. The leaves are small and fall off quickly, leaving the stems looking like sticks. The plant produces small yellow flowers in the spring and summer.