The standard of the two botanically related species Strychnos dolichothyrsa and S. urceolata were by means of TLC and HPLC found to have a qualitatively similar alkaloid content.The presence of bisnor-dihydrotoxiferine and bisnor-C-alkaloid H in S. urceolata could be confirmed with TLC, HPLC, UV and MS, caracurine V with TLC and HPLC.