Alstonia somersetensis

Alstonia somersetensis F. M. Bailey Alstonia spathulata Blume f I - ... 

The third group of Alstonia species contains neither the alstonine nor the echitamine series of alkaloids hence, the genus appears to be divided into three clearly defined sections as far as alkaloid content is concerned. A. macrophylla Wall, contains villalstonine (33, 35), macralstonine (33, 36), macralstonidine, a base M which was obtained in minute amounts only (33), and macrophylline (37). A. villosa Blume contains villalstonine and base V, insufficiently characterized (33) A. somersetensis F. M. Bailey contains villalstonine and macralstonidine (33). 

Certain Alstonia species of the family Apocynaceae contain bisindole alkaloids of interesting construction. These are (+)-villalstonine from Alstonia macro-phylla Wall., A. muelleriana, A. somersetensis F.M. Bailey and A. villosa Blume, (+ )-macralstonine from A. macrophylla Wall., and macralstonidine from A. macrophylla Wall, and A. somersetensis F.M. Bailey. A common unit of all three dimers is the monomeric indolic base macroline. 

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