This weed showed up several years ago and is rapidly spreading. The small flowers are actually lavender, not white as they appear in the photo.
Elephantopus elatus is not listed for Maryland. Could be Elephantopus carolinianus which is quite similar to it.
from: http://2bnthewild.com/plants/H373.htm Maybe: Elephantopus tomentosus http://2bnthewild.com/plants/H58.htm
It is probably elephantopus carolinianus. We are well within the range, and there is at least one leaf on the stem in addition to basal leaves. Thank you all for the help.