The Rocky Mountain states and all states to the west
Up to 12 inches (the flower stalks); stems are prostrate
Lake margins, streambanks, wet meadows, from near sea level to 11,000 feet
Opposite, ovate or round, up to 1.5 inches long
Flowers of veronica serpyllifolia are usually pale blue, with darker blue lines (ssp humifusa), but can also be pale purple to white (the non-native ssp serpyllifolia, which has limited distribution in the Pacific Northwest). Flowers are around a quarter of an inch in diameter, formed of four lobes, of which the lowest is noticeably smaller than the upper three, and is paler in color, lacking the darker streaks. The center of the flower is green, and contains two stamens, exserted a little above the lobes; these have pale purplish filaments and dark blue anthers. Underneath are four green sepals, approximately equal in size.
The small leaves are oval or nearly round, and may have shallowly lobed margins. Leaf tips are obtuse. Leaves are attached by short stalks. Stems are generally prostrate, and readily take root from the leaf nodes; only the tip points upwards. Stems have a covering of short hairs, most densely towards the tip. Sepals and pedicels are glandular hairy.