Mazus miquelii, commonly known as Miquel's mazus^[2] or creeping mazus,^[3] is a species of herbaceous perennial groundcover native to Japan and China.^[1] Mazus reptans is now considered a heterotypic synonym of M. miquelii,^[4][5] but is still often used in the ornamental plant trade.

Mazus miquelii spreads rapidly by producing significant amounts of slender stolons which root at the nodes.^[6] The leaves are undivided and teethed along the margins. The blue or purple flowers are bilateral and have 5 petals,^[7] The plants flower during the months of June to August. This species is hermaphroditic and is pollinated by insects.^[1]

Mazus miquelii has been introduced in North America, and as such is considered an invasive weed, especially in parts of the north-eastern United States.^[6] This species thrives in damp, bog-like conditions, and cannot tolerate dry periods.^[1]