The seeds of forbs, grass, and woody halophytes were collected from a cool moist temperate habitat of North America and subtropical maritime desert conditions of Karachi, Pakistan. Sodium, potassium, calcium, magnesium, and chloride concentrations as well as total ash content were determined. Ion concentrations of seeds are expressed both as relative values and on a dry weight basis. Plants were found to vary in the total ash content of seeds and the relative distribution of ions. In general, temperate forbs and grasses had lower ion content of seeds and several tropical shrub species had the highest ionic content.