California Invasive Plant Council

Hirschfeldia incana

Synonyms: Brassica geniculata, Sinapsis geniculata, Sinapsis incana

Common names: short-pod mustard; Mediterranean mustard; summer mustard; Greek mustard

Hirschfeldia incana (short-pod mustard, summer mustard) is a biennial or short-lived perennial forb (family Brassicaceae) that is native to the Mediterranean. It is shorter in stature than black mustard (<40 dm) and highly branched, with soft-haired, pinnately-lobed leaves, yellow flowers, and short (<1.7 cm) seed pods that are appressed to stems. Short-pod mustard can suppress native vegetation through rapid growth and shading and flourishes in disturbed conditions and recently burned lands. It occurs on roadsides and other disturbed habitat, in shrublands, and in grasslands.

Cal-IPC Rating: Moderate?

Explanation of Cal-IPC ratings

• High – These species have severe ecological impacts on physical processes, plant and animal communities, and vegetation structure. Their reproductive biology and other attributes are conducive to moderate to high rates of dispersal and establishment. Most are widely distributed ecologically.
• Moderate – These species have substantial and apparent-but generally not severe-ecological impacts on physical processes, plant and animal communities, and vegetation structure. Their reproductive biology and other attributes are conducive to moderate to high rates of dispersal, though establishment is generally dependent upon ecological disturbance. Ecological amplitude and distribution may range from limited to widespread.
• Limited – These species are invasive but their ecological impacts are minor on a statewide level or there was not enough information to justify a higher score. Their reproductive biology and other attributes result in low to moderate rates of invasiveness. Ecological amplitude and distribution are generally limited, but these species may be locally persistent and problematic.
• Alert – An Alert is listed on species with High or Moderate impacts that have limited distribution in California, but may have the potential to spread much further.
• Watch – These species have been assessed as posing a high risk of becoming invasive in the future in California.

CDFA Rating: None?

Explanation of CDFA ratings

• A – A pest of known economic or environmental detriment and is either not known to be established in California or it is present in a limited distribution that allows for the possibility of eradication or successful containment.
• B – A pest of known economic or environmental detriment and, if present in California, it is of limited distribution.
• C – A pest of known economic or environmental detriment and, if present in California, it is usually widespread.
• D – An organism known to be of little or no economic or environmental detriment, to have an extremely low likelihood of weediness, or is known to be a parasite or predator.
• Q – An organism or disorder suspected to be of economic or environmental detriment, but whose status is uncertain because of incomplete identification or inadequate information.
• * – An asterisk next to the rating indicates that a plant is included in the CCR Section 4500 list of California State Noxious Weeds.
• -* – This plant is included in the CCR Section 4500 list of California State Noxious Weeds, but is otherwise not rated.

More details

Assessment(s)

Hirschfeldia incana 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.

Weed Management Notes

• Management Notes - Information on management techniques and effectiveness from the University of California Cooperative Extension’s Weed Research & Information Center.

Cal-IPC Newsletter Articles

• Invasive plants research at UC Riverside. Holt, Jodie S.. Vol 13, Issue 2
• Federally listed species vs. mustard. Kitz, Jo. Vol 08, Issue 1
• Control of exotic plants in an herbaceous understory. Perala, Christine; Hoover, Doris A.; Parra-Szijj, E.A.. Vol 01, Issue 3

Cal-IPC Symposium Presentations

Presentations are linked where available. Where a presentation is not available, find more information by reading the abstract in the Cal-IPC Symposia Archive.

• Control of invasive plants after the Scorpion Fire on Santa Cruz Island. Woolsey, Jay; Parker, Mike; Carter, Katy; Little, Annie; Cowan, Clark (2022)
• The role of fire in managing invasive species at the Santa Rose Plateau Ecological Reserve. Laskey, Hailey; Principe, Zach (2022)
• Mapping weeds and rare plants to inform management and conservation in the Zaca and Jesusita fires. Calloway, Stephanie; Schneider, Heather; Knapp, Denise (2018)
• Evidence that plant-associated methylotrophic bacteria aid in grassland and coastal sage scrub restoration. Irvine, Irina; Witter, Marti; Brigham, Christy; Martiny, Jennifer B.H.; Suding, Katharine (2009)
• Does horse manure harbor invasive plants? Quinn, Lauren; Davis, Bonnie; Kolipinski, Mietek; Ghosh, Sibdas (2006)
• Blurring edges: A test of weed control methods used along edges of sage scrub patches to encourage shrub colonization into abandoned agricultural fields. Maher, Eliza; Stanton, Edward (2005)
• Phenology of Brassica tournefortii in comparison to B. nigra, B. geniculata, and native Mojave Desert annuals. Marushia, Robin; Holt, Jodie (2005)
• California’s fading wildflower legacy. Minnich, Richard A. (2004)
• The effects of fire frequency and firebreaks on the abundance and species richness of exotic plant species in coastal sage scrub. Giessow, Jason; Zedler, Paul (1996)

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• Effects of exotic plants on three California ecosystems. Minnich, Richard A. (1994)

Other Hirschfeldia incana Information

• CalPhotos - Images of plants taken mostly in California.
• Calflora - Distribution map and records of this species in California.
• CalWeedMapper - Distribution map of this species in California with ability to determine regional priorities.
• EDDMapS - Distribution of this species in North America.
• Jepson Interchange - Information on this plant's taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
• USDA PLANTS Database - Information on identification and distribution, with links to websites in individual states.

Additional photos