Magnofiorine (1), haplopine (2) and hordenine (3) were isolated from the wood of Zanthoxylum microcarpum Griseb. (Rutaceae), while the bark yielded magnofiorine, decarine (4) and N-nornitidine (5). Small twigs and branches yielded N-methyltvramine (6) and 5,6-dihydro-6-hydroxymethylfagaridine (8). Hordenine was also found in the leaves. N-nornitidine was previously known as a synthetic, but not as a natural product. 5,6-Dihydro-6-hydroxymethylfagaridine is a new compound. Hordenine was isolated from the bark of Z. procerum Don., while the wood was found to contain 6,7,8-trimethoxycoumarin (9), 3,4,5-trimethoxvcinnamaldehyde and methyl-3,5-dime thoxy-4-hydroxybenzoate. The leaves, of which only a small sample was wras available, showed the presence of bishordeninyl terpene alkaloids, but not in sufficient quantity for separation and purification. © 1981, American Chemical Society. All rights reserved.