THE BIOLOGY OF CANADIAN WEEDS.: 50. Hypochoeris radicata L.

Abstract

This paper provides a summary of biological data on Hypochoeris radicata L. (spotted cat’s-ear). This weed is naturalized in Canada on both the west and east coasts but is common only on Vancouver Island, the Queen Charlotte Islands, and the adjacent mainland of British Columbia. It is adapted to a wide range of habitats such as lawns, fields and along roadsides. The species is commonly mistaken for dandelion (Taraxacum officinale Weber), fall hawkbit (Leontodon autumnalis L.) or Hypochoeris glabra L. due to the close resemblance of their bright yellow flowers. This last species is the only other member of the genus occurring in Canada and it hybridizes readily in nature with H. radicata. Several herbicides can be used to control H. radicata.