Mazus reptans is a mat-forming perennial with rosettes of lance-shaped toothed leaves. It spreads quickly through rooting stems. From late spring to mid-summer, it bears 2- to 5-flowered racemes of snapdragon-like purple-blue flowers with lower lips spotted with yellow and red. Noteworthy Characteristics: Fills in quickly without being aggressive. Use between stepping stones or to cover large patches of soil.