Rhizoma Sparganii is a traditional Chinese medicine for bad stomach. A new N-heterocyclic Al complex glycoside was isolated from aqueous extractive of dried rhizome of Sparganium stoloniferum by column chromatography, and its structure was assigned by spectroscopic methods. The new alkaloid glycoside was named Grailsine-Al-glycoside, yield 5.99% (dry weight / dry rhizome weight). Grailsine-Al-glycoside is the first alkaloid that has been isolated from Rhizoma Sparganii materia medica and, its structure indicates an abundant aluminum complex compound existence in higher plant.

Key words: Rhizoma Sparganii, Grailsine-Al-glycoside, alkaloid, aluminum, al-rich plant.