Taxon: Lactuca canadensis L.

Genus: Lactuca
Family: Asteraceae (alt.Compositae)
Subfamily: Cichorioideae
Tribe: Cichorieae
Subtribe: Lactucinae
Nomen number: 21329
Place of publication: Sp. pl. 2:796. 1753
Link to protologue:
Name Verified on: 23-Feb-2009 by ARS Systematic Botanists. Last Changed: 23-Mar-2010
Species priority site is: Western Regional PI Station (W6)
Accessions: 10 in National Plant Germplasm System (GoogleMap)

Common names:

  • Canada lettuce  (Source: Names Beetle) - English
  • Canada wild lettuce  (Source: AH 505) - English
  • tall lettuce  (Source: Glea Cron ed2) - English
  • wild lettuce  (Source: F SE US) - English

Economic Importance:

  • Weed: potential seed contaminant (found in waste places fide F CalifJep)

Distributional Range:



  • Northern America

    • Eastern Canada: Canada New Brunswick, Nova Scotia, Ontario, Prince Edward Island, Quebec
    • North-Central U.S.A.: United States Illinois, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, Oklahoma, South Dakota, Wisconsin
    • Northeastern U.S.A.: United States Connecticut, Indiana, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia
    • Northwestern U.S.A.: United States Colorado, Idaho, Montana, Oregon, Washington, Wyoming
    • South-Central U.S.A.: United States New Mexico, Texas
    • Southeastern U.S.A.: United States Alabama, Arkansas, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, District of Columbia
    • Southwestern U.S.A.: United States Arizona, California, Nevada, Utah
    • Subarctic America: Canada Yukon Territory
    • Western Canada: Canada British Columbia, Manitoba

  • Naturalized


  • Beetle, A. A. Recommended plant names. Univ. Wyoming Agr. Exp. Sta. Res. J. 31. 1970 (Names Beetle)
  • Browne, E. T. & R. Athey Vascular plants of Kentucky: an annotated checklist. 1992 (L Kentucky)
  • Correll, D. S. & M. C. Johnston Manual of the vascular plants of Texas. 1970 (F Tex)
  • Cronquist, A. et al. Intermountain flora. (Intermt F)
  • FNA Editorial Committee Flora of North America. (F NAmer)
  • Gleason, H. A. & A. Cronquist Manual of vascular plants of northeastern United States and adjacent Canada. (Glea Cron)
  • Gleason, H. A. & A. Cronquist Manual of vascular plants of northeastern United States and adjacent Canada, ed. 2. 1991 (Glea Cron ed2)
  • Hickman, J. C., ed. The Jepson manual: higher plants of California. 1993 (F CalifJep)
  • Hitchcock, C. L. et al. Vascular plants of the Pacific Northwest. (F Pacif NW)
  • Holm, L. et al. A geographical atlas of world weeds. 1979 (Atlas WWeed)
  • Kartesz, J. T. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. (L US Can ed2)
  • Lebeda, A. et al. 2004. Geographical distribution of wild Lactuca species (Asteraceae, Lactuceae) Bot. Rev. (Lancaster) 70:328-356
  • Magee, D. W. & H. E. Ahles Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. (F NE US)
  • Martin, W. C. & C. R. Hutchins A flora of New Mexico. (F New Mex)
  • McGregor, R. L. et al. (The Great Plains Flora Association) Flora of the Great Plains. (F GPlains)
  • McGregor, R. L. et al. (The Great Plains Flora Association) Atlas of the Flora of the Great Plains. (Atlas GPlains)
  • Munz, P. A. & D. D. Keck A California flora. (F CalifMunz)
  • Porcher, M. H. et al. Searchable World Wide Web Multilingual Multiscript Plant Name Database (MMPND) (on-line resource). (Pl Names)
  • Radford, A. E. et al. Manual of the vascular flora of the Carolinas. (F Carolin)
  • Radford, A. E. et al., eds. Vascular flora of the southeastern United States. (F SE US)
  • Scoggan, H. J. The flora of Canada, 4 vol. (F Canada)
  • Steyermark, J. A. Flora of Missouri. (F Missouri)
  • Terrell, E. E. et al. Agric. Handb. no. 505. 1986 (AH 505)
  • Welsh, S. L. et al. A Utah flora. (F Utah ed2)
  • Wofford, B. E. & R. Kral Checklist of the vascular plants of Tennessee. 1993 (L Tenn)
  • Wunderlin, R. P. Guide to the vascular plants of Florida. 1998 (F Florida)

Check other web resources for Lactuca canadensis L. :


  • Fruits: U.S. National Seed Herbarium image
  • Fruits: U.S. National Seed Herbarium image