The subject of roadside weeds the other day brought up some similarities between Wild Lettuce-Lactuca spp and Chicory-Cichorium intybus. Wild Lettuce is a native while Chicory is alien. Both are prolific, can be added to salads (among other things), have similar looking flowers, and are members of the Aster family.
Also, as mentioned in the Wild Lettuce post, they both are only open in bright daylight. Yesterday was a nice bright overcast sky for a while before it rained so much easier to get an even balance to the lighting than in full sun.