Data on reproductive traits of alpine plants in the central Scandes Mountains (Sweden) are given, namely seed mass, seed number per plant and seed number per unit area of vegetation. Data were obtained 1) by counting reproductive units (whole plants, flower heads, capsules, berries, as applicable) per meter squared in seven distinct vegetation types, 2) by counting the number of seeds per reproductive unit in the lab, and 3) by weighing seeds (discriminating between dispersule and germinule wherever relevant).