Ervatainia corymbosa Roxb. ex Wall (Apocynaceae) is a tree growing to 15 meters in height in Malaysia. The different parts of this plant are used in traditional medicine for treatment of syphilic and orchitis ulcerations. Barks and roots are also utilised in making arrow poison (1). The present note reports on the isolation and identification of the alkaloids from the leaves and stem bark of this species. This work is a part of our continuing research on the genus Ervatamia (2—4). Syneilesis aconitfolia Maxim. (Compositae, subtribe Senecioneae) is a traditional folk remedy which is called "Tu er shan" in China. The whole plant is used as an analgesic and antirheumatic medicine (1). Some terpene glucosides were detected previously in the title plant (2). The present paper describes the isolation of a mixture of two pyrrolizidine alkaloids. Both alkaloids have been isolated previously from Syneilesis palinata (3, 4) but some data have been improved. On the basis of structure-toxicity-relationships, both alkaloids should be toxic (5).