- 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