is a biennial, completes its lifecycle within two years, introduced
from Europe. It reproduces soley by seed and forms a rosette during
its first year of growth. During its second year, a stem bolts, produces
flowers, sets seed, and dies. Houndstongue can grow up to 3 feet tall.
The lower leaves are broad, giving the appearance of a “hound’s tongue”.
The flowers are reddish-purple in color and form seeds with the outer
surface covered with short, barbed prickles. Once these break apart,
they are readily scattered by animals. Houndstongue is toxic to horses
and cattle. This plant contains alkaloids that may cause liver cells
to stop reproducing.
Houndstongue can be found in the foothills of the Front Range. Small
populations have been found in Adams County near the Town of Bennett.