| Noun | 1. | genus Romneya - one species: matilija poppy dilleniid dicot genus - genus of more or less advanced dicotyledonous trees and shrubs and herbs family Papaveraceae, Papaveraceae, poppy family - herbs or shrubs having milky and often colored juices and capsular fruits California tree poppy, matilija poppy, Romneya coulteri - tall branching subshrub of California and Mexico often cultivated for its silvery-blue foliage and large fragrant white flowers |