Alstonia ScholarisAlstonia scholaris, commonly known as the "Devil's Tree," is an evergreen tree belonging to the family Apocynaceae. Native to the Indian subcontinent, Southeast Asia, and certain parts of Australia, this tree is widely distributed and can be found in various tropical and subtropical regions. Plant Description: Size: The Alstonia scholaris tree can grow to a height of 20 to 40 meters (65 to 130 feet) tall, depending on the growing conditions and age.