Prunella vulgaris L.
Lamiaceae (Mint family)
Opposite, egg- to lance-shaped, 0.75 to 4 inches long with smooth to slightly toothed margins. Leaves are sparsely hairy to smooth with crinkled upper surfaces.
Prostrate, stoloniferous stems are square in cross-section and capable of rooting at the nodes to form dense patches. Flowering stems may reach up to 2 feet in height.
Flowers and fruit
Flowers have blue-violet to purple petals fused into a two-lipped tube and formed in dense spikes atop erect stems. Large, green to purple bracts are present at each flower. Four brown nutlets are formed at each flower.
Seeds and creeping stems.