Chaiturus marrubiastrum (L.) Rchb.  
Family: Lamiaceae
horehound motherwort, lion's-tail
[Leonurus marrubiastrum L.]
Chaiturus marrubiastrum image
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
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