Goniothalamus tamirensis

Goniothalamus tamirensis is a species of plant in the family Annonaceae. It is native to Cambodia, Laos, Thailand and Vietnam. The French botanists J.B. Louis Pierre and François Gagnepain, who first formally described the species, named it after the region in Cambodia it was collected from, which they record as “monts Tamir”. Bioactive molecules extracted from its leaves have been reported to have mitogenic activity in tests with cultured mouse osteoblasts. It is a bush reaching 3 to 4 meters in height. Its leaves are 12-17 centimeters by 37-47 millimeters and come to a point at the tip. The leaves are smooth on their upper side and have rusty colored hairs on their undersides. The flowers are solitary or in pairs and are axillary. Its 3 sepals are triangular, smooth on the inside, and have rusty colored hairs on their outer surfaces. Its 6 petals are arranged in two rows of 3. The outer petals are fleshy and come to a point at their tip. The inner petals are rhomboidal, thick, and smooth inside. It has numerous stamens. The pollen of G. tamirensis is shed as permanent tetrads.