- Solanum rostratum is an annual herbaceous plant that can grow up to 2 ft. (0.6 m) tall.
- Stems and leaves have extremely sharp spines, so take care when handling. Leaves are alternate, bright green, petiolate, 4-5 in. (10.2-12.7 cm) long, and pinnately lobed.
- Flowers have five petals and are yellow, and 1 in. (2.5 cm) across. Calyx tube is 1 in. (2.5 cm) long, and spiny. Flowering occurs from May to October.
- Fruits are dry berries up to 0.4 in. (1 cm) in diameter covered in sharp spines and contain several wrinkled, flat, black seeds.
- Ecological Threat
- S. rostratum prefers moist soils and areas like pastures, waste ground, and roadsides. Although it is native to most of North America, it is considered a noxious weed in some states.
King County Department of Natural Resources and Parks Water and Land Resources Division 
Oregon Department of Agriculture Plant Programs, Noxious Weed Control 
Washington State Noxious Weed Control Board 
University of California, Jepson Flora Project 
Virginia Tech Weed Identification Guide 
USDA NRCS PLANTS 
USDA ARS GRIN 
Images from Bugwood.org