Lepidium latifolium

Lepidium latifolium_perennial pepperweed_JM DiTomaso
Photo courtesy Joseph DiTomaso

Synonyms: Cardaria latifolia (L.) Spach

Common names: perennial pepperweed; tall whitetop; broadleaved pepperweed

Lepidium latifolium (perennial pepperweed, tall whitetop) is a perennial herb (family Brassicaceae) found in moist or seasonally wet sites throughout California. Perennial pepperweed is grows very aggressively, forming dense colonies that exclude native species. It reproduces both by seed and vegetatively from its roots and small root fragments. Seeds and root fragments are spread easily by flooding and soil movement, and seeds stick to tires, shoes, and animals, making continued dispersion difficult to avoid. Perennial pepperweed is a state-listed noxious weed in California and many other western states.

Cal-IPC Rating: High

Cal-IPC Assessment

Plant Assessment Form - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.

Cal-IPC Newsletter Articles

Cal-IPC Symposium Presentations

  • Lardiere, B. M. and D. Bieber (2009). Maintaining riparian habitats after initial invasive plant treatments on Camp Pendleton. Cal-IPC Symposium 2009. Visalia, CA, California Invasive Plant Council.
  • Block, G., I. Hogle, et al. (2008). Perennial pepperweed (Lepidium latifolium) control in tidal marsh of San Pablo Bay. California Invasive Plant Council Symposium 2008. Chico, CA, California Invasive Plant Council.
  • Andrew, M. and S. L. Ustin (2008). Ecological remote sensing of invasion by perennial pepperweed. California Invasive Plant Council Symposium 2008. Chico, CA, California Invasive Plant Council.
  • Vanderhoof, M. and C. Rogers (2007). Distributional patterns of perennial pepperweed (Lepidium latifolium) in the San Francisco Bay, a CalFed project. California Invasive Plant Council Symposium 2007. San Diego, CA, California Invasive Plant Council.
  • Hutchinson, R. A., J. H. Viers, et al. (2007). Assessing non-target vegetation response in the wake of perennial pepperweed (Lepidium latifolium) eradication at the Cosumnes River Preserve. California Invasive Plant Council Symposium 2007. San Diego, CA, California Invasive Plant Council.
  • Erskine-Ogden, J., M. J. Renz, et al. (2007). Managing herbaceous perennials in the Tahoe Basin. California Invasive Plant Council Symposium 2007. San Diego CA, California Invasive Plant Council.
  • Codianne, J. and L. Dumont (2007). Coyote Creek floodplain reclamation project: Re-establishing native plant habitat. California Invasive Plant Council Symposium 2007. San Diego, CA, California Invasive Plant Council.
  • Etra, J. (2006). Tall whitetop control on the 102 Ranch and implications for other applications. Cal-IPC Symposium. Rohnert Park, CA.
  • Leininger, S. and T. C. Foin (2006). Water, salt, and pepper: Lepidium latifolium invasion potential along a salinity and moisture gradient. Cal-IPC Symposium. Rohnert Park, CA.
  • Spenst, R. and T. C. Foin (2006). Is glyphosate a good choice for perennial pepperweed (Lepidium latifolium) control in tidal wetlands in the San Francisco Estuary? Cal-IPC Symposium. Rohnert Park, CA.
  • Wilson, R., J. DiTomaso, et al. (2006). Integrated management strategies for perennial pepperweed. California Invasive Plant Council Symposium '06. Rohnert Park, CA.
  • DiTomaso, J. M. (2005). Efficacy and safety of new herbicides on the horizon. California Invasive Plant Council Symposium 2005. Chico, CA.
  • Hogle, I. B. and R. Waegell (2005). Perennial pepperweed control experiment at the Cosumnes River Preserve. California Invasive Plant Council Symposium 2005. Chico, CA.
  • Sperber, T. and F. T. Griggs (2005). Suppressing exotic weeds on restoration projects using an aggressive herbaceous understory. California Invasive Plant Council Symposium 2005. Chico, CA.
  • Brigham, C. (2004). Towards eradication of Lepidium latifolium at Paramount Ranch: Control methods and a test of restoration treatments. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Clines, J., J. DiTomaso, et al. (2004). Fire working group. California Invasive Plant Council Symposium 2004. Ventura, California, CA.
  • Giessow, J. and M. Newhowser (2004). Riparian working group. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Hogle, I. H., J. H. Viers, et al. (2004). Floodplain invasion: Tracking pepperweed expansion in the Cosumnes River. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Rogers, C. (2004). Distribution of perennial pepperweed in Bay-Delta wetlands: a CalFed mapping project. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Schoenig, S., D. DiPietro, et al. (2004). Mapping working group. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Spenst, R. O., T. C. Foin, et al. (2004). Invasion dynamics of perennial pepperweed along the salinity gradient. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Carruthers, R. and J. Buettner (2003). Biocontrols: Progress and ongoing needs. California Invasive Plant Council Symposium 2003. Kings Beach, California, CA.
  • Donaldson, S., W. West, et al. (2003). Getting the job done: Working within the regulatory environment at Lake Tahoe to manage weeds. California Invasive Plant Council Symposium 2003. Kings Beach, CA.
  • Dudly, T. (2003). Riparian invaders: A multi-species approach. California Invasive Plant Council Symposium 2003. Kings Beach, CA.
  • Hogle, I., J. H. Viers, et al. (2003). Spatial analysis of perennial pepperweed infestation in a seasonal floodplain. California Invasive Plant Council Symposium 2003. Kings Beach, CA.
  • Peters, S., J. Etra, et al. (2003). Tall whitetop eradication and native plant community restoration. California Invasive Plant Council Symposium 2003. Kings Beach, CA.
  • Wilson, R. (2003). Perennial pepperweed: What works? California Invasive Plant Council Symposium 2003. Kings Beach, CA.
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  • Pyke, D. A. (2000). The use of fire to control exotic plants. California Exotic Pest Plant Council Symposium 2000. Concord, CA.
  • Thomsen, C. D. (2000). Bear Creek watershed restoration program. California Exotic Pest Plant Council Symposium 2000. Concord, CA.
  • Renz, M. J. and J. M. DiTomaso (1999). Mechanism(s) responsible for enhancing the effectiveness of glyphosate in controlling perennial pepperweed. California Exotic Pest Plant Council Symposium '99. Sacramento, CA.
  • Kelly, M. (1998). SWAT: Special weed action teams as ambassadors for education and energy. California Exotic Pest Plant Council '98 Symposium. Ontario, CA.
  • DiTomaso, J. M. (1997). Risk analysis of various weed control methods. California Exotic Pest Plant Council Symposium '97. Concord, CA.
  • Donaldson, S. G. (1997). Flood-borne noxious weeds: Impacts on riparian areas and wetlands. California Exotic Pest Plant Council Symposium '97. Concord, CA.
  • DiTomaso, J. M. (1995). Overview of extension non-crop weed research in California. California Exotic Pest Plant Council Symposium '95. J. Lovich, J. Randall and M. Kelly. Pacific Grove, CA.
  • Young, J. A., D. E. Palmquist, et al. (1995). Ecology and control of perennial pepperweed (Lepidium latifolium L.). California Exotic Pest Plant Council Symposium '95. J. Lovich, J. Randall and M. Kelly. Pacific Grove, CA.

Other Lepidium latifolium Information

  • CalPhotos - Images of plants taken mostly in California.
  • CalFlora - Distribution information based on submitted observations and herbarium specimens.
  • CalWeedMapper - Distribution information with ability to determine regional priorities.
  • Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
  • USDA PLANTS Database - Federal database with information on identification and distribution, and links to websites in individual states.