Chaiturus marrubiastrum (L.) Rchb.
Family: Lamiaceae
horehound motherwort, lion's-tail
[Leonurus marrubiastrum L.]
Chaiturus marrubiastrum image
from USDA Plants website  
Etymology: Chaiturus: possibly from chaet/chait, "bristle" -from the earlier genus Leonurus meaning "lion's tail"
Plants: biennial forb, aromatic; stems square
Leaves: opposite
Flowers: 5-parted
Fruits: 1-seeded nutlet
Conservation Status: Introduced - adventive
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image
from USDA Plants website  
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image
Chaiturus marrubiastrum image