Five new taxoids, taxuspines E similar to H and J (1 similar to 5), have been isolated together with known taxoids (6 similar to 23) containing a series of taxol-related compounds (15 similar to 20) from stems and leaves of the Japanese yew Taxus cuspidata Sieb. et Zucc, and the structures elucidated on the basis of spectroscopic data. The structures and cytotoxicity of these taxoids (1 similar to 23) are described.