Legumes are a category of plants that draw their nitrogen directly from the atmosphere, so they self-fertilize with respect to nitrogen. Pulses specifically are a subcategory of legumes that are the edible seeds of legume plants, excluding oil seeds. In practical terms, for us that's peas, beans, chickpeas, lentils, but it would include lupins, fava beans, etc., in other parts of the world.
On May 1st, 2013. See this statement in context.