- Hyoscyamus niger is an annual or biennial plant that can grow to 3 ft. (1 m) in height.
- The fetid smelling leaves are alternate, simple, toothed, up to 8 in. (20 cm) long and 6 in. (15 cm) wide. In the early season (annual), or first year of growth (biennial) the plant is represented by a rosette.
- Flowering occurs in spring to early fall. Flowers are cream to green, five-lobed, 2 in. (5 cm) wide and have purple throats.
- Seeds are small and black. Prolific seed production increases the spread of this plant, as a single plant can produce up to half a million seeds.
- Ecological Threat
- Hyoscyamus niger is native to the Mediterranean and is poisonous to most mammals. It has been used medicinally for hundreds of years.
Colorado Department of Agriculture, Conservation Services Division 
Colorado Weed Management Association 
Flora of Pakistan, www.eFloras.org 
Nevada Department of Agriculture 
USDA NRCS PLANTS 
USDA ARS GRIN 
Images from Bugwood.org