**4. Conclusions**

Among the 12 mangroves, *Pongamia pinnata*, *Cerbera manghas*, *Barringtonia racemosa* have been carried on deep researches concerning their chemical constituents, biological activities. Some compounds isolated from the semi-mangroves were proved to have obvious activities as the two cardenolides of GHSC-73 and GHSC-74. However, as proposed by Shao Changlun "Some semi-mangrove plants have not yet been analyzed and interpreted on their chemical constit‐ uents and pharmacological effects", the further researches of the semi-mangrove plants will make an important contribution to for the finding of new drugs.
