creeping bugleweed
Ajuga decumbens, a low-growing perennial herb. The Japanese name literally means 'lid of hell's cauldron', possibly from its traditional medicinal use or appearance.
See also: キランソウ
Creeping bugleweed is a perennial that produces purple flowers in spring.
Synonym; キランソウ is the more common name for the same plant, while 地獄の釜の蓋 is a less common, more descriptive alternative.
The name literally means 'lid of hell's cauldron'. The exact origin is uncertain, but it may refer to the plant's traditional use in herbal medicine or its rosette-like leaf arrangement.