brittle-stem hemp-nettle, common hemp-nettle, hemp-nettle
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; 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
WIS DNR-Bureau of Endangered Resources: Detailed information on Wisconsin invasive species including decription, habitats, control methods USDA Plants Database: Federal Distribution and detailed information including photos USDA Agricultural Research Service (ARS): Images of seeds, fruits, embryos, etc. Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"