If a grass seedling is only an inch tall and it is beginning to tiller, as is this seedling, it is a safe bet you are looking at sprangletop. Sprangletop can exhibit several growth habits depending on environmental conditions. In a dry field seedlings often take on the form shown at left producing three to four leaves and tillers by the time they are an inch tall. In water seeded or other flooded situations I have seen tall slender plants with only a couple of leaves and no tillers. Knowing the history of the field will lend a hand, but knowing the habits of the plant as well as its biological characteristics is the only way to be sure of its identity.