Through Feb. 15, “In Focus: Photographing Plants,” featuring plant pictures from the 20th and 21st centuries. Through Mar 1, “Imprinted: Illustrating Race,” examines imagery over the course of more than three centuries, which has reflected and shaped perceptions of race across time. 2301 Kentmere Pkwy., Wilmington. Wed–Sun, 10 to 4. $14–$25. DelArt.org