- Linaria vulgaris is a perennial herb that can reach 3.3 ft. (1 m) tall with erect, smooth stems that emerge in clumps from a spreading root system.
- Leaves are nearly sessile, drooping, linear and 1-2 in. (2.5-5 cm) long. Leaves can sometimes be sparsely covered by long hairs.
- Flowering occurs from May to September, when yellow/white, snapdragon-like flowers develop. Flowers, including the spur, are 0.6-1.2 in. (1.5-3 cm) long and occur in racemes at the apex of the stems.
- Fruits are capsules that are 0.4-0.5 in. (9-12 mm) long. Each capsule contains small, flat blackish seeds with a papery wing.
- Ecological Threat
- Linaria vulgaris occurs in fields, pastures, roadsides, undisturbed prairies and rangelands. It is native to Europe and was introduced into North America, as an ornamental, in the mid 1600s.
Global Invasive Species Database. 2011. Invasive Species Specialist Group (ISSG) of the IUCN Species Survival Commission 
University of Alaska Anchorage, Alaska Natural Heritage Program 
Washington State Noxious Weed Control Board 
University of California, Jepson Flora Project 
Colorado Weed Management Association 
Ohio Perennial & Biennial Weed Guide 
Flora of China, www.eFloras.org 
California Invasive Plant Council 
New Mexico State University 
USDA NRCS PLANTS 
USDA ARS GRIN 
Images from Bugwood.org