Four new dimeric indole alkaloids, named ervahaimine A [1) ervahaimine B {2}, ervahainamidine A {3}, and ervahainamidine B {4}, were isolated from the roots of Ervatamia hainanensis. The structures of these new alkaloids have been elucidated by spectral data in correlation with compounds of established structures. The structures of ervahaimine A and ervahaimine B have been confirmed by partial synthesis. © 1989, American Chemical Society. All rights reserved.