Kickxia spuria (L.) Dumort.
Family: Plantaginaceae
round-leaved cancerwort
Kickxia spuria image
from USDA Plants Website  
Etymology: Kickxia: after Jean Kickx Jr. (1803-1864), and/or his father Jean Kickx (1775-1831); Belgian professors of botany
Plants: drooping or trailing annual, to 24" tall forb, finely hairy throughout; stems not rooting
Leaves: round to oval
Flowers: yellow, 5-parted, slender spur at the base, upper lip purple inside; solitary from the leaf axils
Conservation Status: Introduced - adventive