This list might help you:
http://www.garden-counselor-lawn-care.com/identify-lawn-weeds.html
Otherwise use this resource to locate your local cooperative extension office: http://www.ext.vt.edu/offices/
Call them in the morning and tell them that you need a lawn weed ID. They will take it from there. You’ll be asked to bring a chunk of the plant with you. Either the extension agent will do it him/herself or they will have one of your county Master Gardeners do it. There will be no charge to you.
That Garden Counselor link .. is Great!
Thank You and .. Book Marked!