I have a perennial that has been passed down from my Grandmother. It comes up looking like wide blades of grass, but has a white stripe down the center. Then is blooms with white, star-like flowers. The flowers close up during the day and open up toward evening. It also is a small bulb, when I dig it up to divide it. I am a new member, so was not sure yet how to post a picture. Thank you for your help.