Brittlestem hempnettle (Galeopsis tetrahit)
Common Names: HempnettleDescription: Delays the establishment of native species in areas.
Habit: Annual; erect; ranges from 1/2 to 3 ft tall.
Leaves: 1-5 in long, short- stalked, opposite, ovate-lanceolate to lanceolate, and sparsely pubescent on both sides.
Stems: Swollen below leaf nodes; erect; simple or branched; 1/2 - 3 ft tall.
Flowers: Terminal or borne in axillary clusters, range in color from purple and pink to white, 1/2 - 3/4 in long, bilaterally symmetrical with split lower lip.
Fruit and seeds: Seeds are egg shaped, mottled grayish brown.
Habitat: Native to Europe and Asia. Found in disturbed sites, roadsides, gardens, agricultural lands; Requires constant moisture.
Reproduction: By seed.
Similar species: Wild mint (Mentha arvensis); American dragonhead (Dracocephalum parviflorum) and Hairy hedgenettle (Stachys pilosa).
Monitoring and rapid response: Hand-pulling for small infestations; cutting. Credits: The information provided in this factsheet was gathered from the USDA PLANTS Database.
Individual species images that appear with a number in a black box are courtesy of the Bugwood.org network (http://www.invasive.org).Individual photo author credits may not be included due to the small display size of the images and subsequent difficulty of reading the provided text. All other images appear courtesy of Google (https://images.google.com).