Blackboard tree Alstonia scholaris [L.] R. Br is also commonly called the Indian devil tree, Ditabark, Milkwood pine, White cheesewood and Pulai. Plants are usually grown in mixed forest and small forest in the countryside, found from the lowlands to 900 m above sea level. Blackboard tree Alstonia scholaris [L.] R. Br sometimes planted in the garden or planted as an ornamental tree. Plant a tree, height 20-25 m. Trunk straight, reaching 60 cm in diameter, woody. Brittle bark, it's very bitter, white gummy. Single leaf, whorls 4-9 strands, stemmed length from 7.5 to 15 mm, oblong or ovoid shape, the upper surface smooth, lower surface opaque, flat edge, the length of 10-23 cm, width 3 to 7.5 cm, green color. Compound interest arrayed in long handle, exit end of the shaft. Flowers fragrant light green to yellowish white, smooth haired tight. Fruit length 20-50 cm, hanging. Small seeds, length of 1.5 - 2 cm, hairy tuft at the edges and at the ends.
The composition of Blackboard tree Alstonia scholaris [L.] R. Br:The chemistry and pharmacological effects: Bark bitter taste, no smell.
- The bark contains alkaloids ditain, ekitamin (ditamin), ekitenin, ekitamidin, alstonin, ekiserin, ekitin, ekitein, porphyrin, and triterpenes (alpha-amyrin and lupeol).
- Leaves contain pikrinin.
- Flowers ursolat acid and lupeol.
- Active substances triterpenoids from the bark can lower blood glucose levels rabbits
- Bark water extract in vivo can suppress power pig roundworm eggs infections (Ascaris suum) at a dose of 130 mg / ml and in vitro suppress Development embryonated eggs into larvae's at a dose 65 mg / ml.
- Infusion of 10% bark at a dose of 0.7; 1.5 and 39/kg mm rabbit has the effect hipoglikernik.