Bugle

Ajuga reptans, commonly known as bugle, blue bugle, bugleherb, bugleweed, carpetweed, carpet bungleweed, common bugle, is an herbaceous flowering plant native to Europe. It is invasive in parts of North America.
Ajuga reptans has dark green leaves with purple highlights. It is a spreading ground cover that grows in a dense mat. The leaves grow 5–8 cm (2–3 in) high but in the spring it sends up 10–15 cm (4–6 in) tall flower stalks with many purple flowers on them.