Many plants depend on animals for seed dispersal,most notably by (1) frugivory and defecation of seeds by birds and mammals, (2) scatter hoarding and neglect of stored nuts and seeds by rodents and birds,and the (3) harvest of elaiosome-bearing seeds by ants.A number of environmental factors (climate,vegetation,occurrence of mutualistic partners) influence the distribution of plants with these types of seed dispersal,but a comprehensive,continent-wide survey has never been conducted.We examined the distribution of these three types of mutualisms,focusing primarily on rodent dispersal,by examining the composition of plants lists (floras) from 197 sites scattered across North America north of Mexico.These sites typically ranged in size from ≈1000 – 1,000,000 hectares and averaged 627 plant species per site.Our database has ≈123,519 terrestrial plant records,including nearly 1655 species of plants dispersed by animal mutualists.We recorded 272 plant taxa that are dispersed by scatter-hoarding rodents (3.6±1.7%of all plants in our database) .Primary dispersal by rodents (harvest directly from plants) was found in 2.5%of plants and secondary dispersal (harvest of seeds from the feces of frugivorous animals) account for 1.1%of plants.These kinds of plant-animal interactions are most prevalent in the eastern deciduous forest of the United States and in the American Southwest.Dispersal by scatter-hoarding rodents is almost entirely absent from northern Canada.The distribution of scatter-hoarding seed-dispersal mutualisms is correlated with latitude and precipitation.