English: Alstonia angustiloba Miq. or Pulai Hitam, it is called by Kalimantan people, especially Balikpapan people. A two hours trip from the city center to the Balikpapan Botanic Garden, drove me to the shade of the jungle.

New year holidays, January 11th 2020, I spent my holiday by going around the botanical garden area. Forest tracks with natural nuances, the sound of forest insects, surrounded by endemic Kalimantan trees, made me friendly with the sunny weather at that time. Balikpapan Botanical Garden's tour guide welcomed me with enthusiasm, he told the age of the trees and various interesting information. This Pulai Hitam Tree, more than five years old with almost 20 meters height and about 150 centimeters diameter. It grows naturally in Malaysia, Sumatra, Java, and Kalimantan, in primary forests in the lowlands to an altitude of 500 meters above sea level.

The tree is surrounded by several small plants such as Bandang and Meranti trees, the height of these tree makes me call it as the guardian of Balikpapan Forest.