Avena barbata

Avena barbata_slender oat_JM DiTomaso
Photo courtesy Joseph DiTomaso

Common names: slender oat

Avena barbata (slender wild oat) is a winter annual grass (family Poaceae) that grows in nearly every grassland area of the state. It does well in sandy/poor soils, often on the road verges. It is one of the annual grasses that was introduced as a forage species and has replaced the native perennial grasses.

Rating: Moderate

Cal-IPC Resources

  • 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.
  • CalWeedMapper - Statewide maps, climate models, and reports.
  • Cal-IPC News - Our quarterly newsletter. Each issue is available as a pdf.
  • Cal-IPC Symposium Proceedings - Presentations and papers from our annual Symposium.
  • Don't Plant a Pest! - Select your region to find non-invasive alternatives to ornamental species. Also see our statewide brochure on trees.

    Other Resources

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

    Symposium Presentations

    • McGray, H. G. and K. N. Suding (2010). Resident community species diversity and invader genetic diversity do not affect the establishment of an annual exotic grass. Cal-IPC 2010 Symposium. Ventura, CA, California Invasive Plant Council
    • McGray, H., M. Lombardo, et al. (2008). Interactive effects of population genetic diversity and resident community composition on the success of an annual exotic invasive species. California Invasive Plant Council Symposium 2008. Chico, CA, California Invasive Plant Council.
    • Burrascano, C. (2001). Review of the impact of invasive weeds on two endangered plant species: Acanthomintha ilicifolia (San Diego thornmint) and Monardella linoides ssp. viminea (willowly monardella). California Exotic Pest Plant Council Symposium 2001. San Diego, CA.
    • Corbin, J. D., M. Thomsen, et al. (2004). Out of the frying pan: Invasion of exotic perennial grasses in coastal prairies. California Invasive Plant Council Symposium 2004. Ventura, CA.
    • Giessow, J. and P. Zedler (1996). The effects of fire frequency and firebreaks on the abundance and species richness of exotic plant species in coastal sage scrub. California Exotic Pest Plant Council Symposium '96. San Diego, CA.
    • Maher, E. and E. Stanton (2005). Blurring edges: A test of weed control methods used along edges of sage scrub patches to encourage shrub colonization into abandoned agricultural fields. California Invasive Plant Council Symposium 2005. Chico, CA.
    • Minnich, R. A. (1994). Effects of exotic plants on three California ecosystems. California Exotic Pest Plant Symposium '94. Sacramento, CA.
    • Minnich, R. A. (2004). California’s fading wildflower legacy. California Invasive Plant Council Symposium 2004. Ventura, CA.
    • Sanders, A. C. (1998). Invasive exotics in California: A perspective from inland Southern California. California Exotic Pest Plant Council Symposium '98. Ontario, CA.
    • Wills, R. (1993). The effects of fire on introduced annual grasses. California Exotic Pest Plant Symposium '93. Westlake Village, CA.

    Cal-IPC News Articles

    • Young, S. L. (2002). Exploring alternative methods for vegetation control and maintenance along roadsides. CalEPPC News. 10: 5-7.