Galeopsis tetrahit L.  
Family: Lamiaceae
brittle-stem hemp-nettle, common hemp-nettle, hemp-nettle
Galeopsis tetrahit image
Janice Stiefel  
Etymology: Galeopsis: Greek for "weasel" and "appearance," from likeness of corolla to head of a weasel
Plants: erect, annual, 6"-36" tall forb, aromatic, branched toward the top when mature; stems square, swollen at the leaf nodes, and with rough, coarse, spreading hairs; taprooted
Leaves: opposite, stalked, ovate, coarsely toothed
Flowers: pink to white often with 2 yellow or white spots, 5-parted, 3/4" long, irregularly tube-shaped; flower drawing inflorescence of several, dense, rounded whorls terminal and from the upper leaf axils; blooms June-Sept.
Fruits: 1-seeded nutlet
Habitat: disturbed sites
Invasiveness: Restricted Invasive - Eradicate!
Conservation Status: Introduced - naturalized; ecologically invasive
Galeopsis tetrahit image
Janice Stiefel  
Galeopsis tetrahit image
Kitty Kohout  
Galeopsis tetrahit image
Matthew L. Wagner  
Galeopsis tetrahit image
Matthew L. Wagner