ARLINGTON VOLUNTEERS Kelly Wilson, a horticulturist at Arlington National Cemetery, explains the purpose of planting milkweed, the only species of plant that Monarch butterfly larvae will eat, to a group of nearly 30 children, during the 16th annual Renewal and Remembrance Volunteer Day of Service at Arlington National Cemetery, Arlington, Va., July 9, 2012. SHARE IMAGE: Download Image: Full Size (0.1 MB) Photo By: VIRIN: 415284-S-RAZ51-851.jpg Photo Gallery