Two novel quinoline alkaloid β-D-mannopyranosides, named dictamnine-7-β-D-mannopyranoside (1) and 8-methoxydictamnine-7-β-D- mannopyranoside (2), were isolated from the whole plant of Solidago canadensis. Their structures were identified on the basis of a spectroscopic analysis. © 2009 Verlag Helvetica Chimica Acta AG.