Description and Life Cycle
A perennial, spreading by creeping roots and seeds. Stems, growing up to 80 cm high, are hairless and usually un-branched. Leaves are numerous, one per node, essentially stalk-less, and 2-10 cm long by 1-5 mm wide. The leaves are also hairless and usually narrowed towards the base. Bright yellow "snapdragon" flowers are 2-3.5 cm long on stalks about 5 mm long.
Biological Control Agents
Cranston, R., D. Ralph and B. Wikeem. 2005. Field guide to noxious and other selected weeds of British Columbia. Gov. of BC. 94 p.
Powell, G. W., A. Sturko, B. Wikeem and P. Harris. 1994. Field guide to the biological control of weeds in British Columbia. B.C. Min. For. Res. Prog.