In many cities laid out on a grid plan, the streets are named to indicate their location on a Cartesian coordinate plane. For example, the Commissioners' Plan of 1811 for Manhattan provided for numbered streets running parallel to the minor axis of the island and numbered and lettered avenues running parallel to the long axis of the island, although many of the avenues have since been assigned names for at least part of their courses. In the city plan for Washington, D.C., north-south streets were numbered away from the United States Capitol in both directions, while east-west streets were lettered away from the Capitol in both directions and diagonal streets were named after various States of the Union. As the city grew, east-west streets past W Street were given two-syllable names in alphabetical order, then three-syllable names in alphabetical order, and finally names relating to flowers and shrubs in alphabetical order. Even in communities not laid out on a grid, such as Arlington County, Virginia, a grid-based naming system is still sometimes used to give a semblance of order.