Trifolium hirtum (rose clover)

Trifolium hirtum

Photo courtesy Joseph DiTomaso

Trifolium hirtum (rose clover) is an annual forb/herb (family Fabaceae) commonly found in California, blanketing dry rangelands. Rose clover out competes indigenous clover and native grasses and can tolerate dryer soils and frost. It was intentionally introduced as grassland forage and in most rangeland systems is not considered weedy. However, in wildlands, it can out-compete native clovers.

Cal-IPC Inventory rating: Moderate

Cal-IPC Resources on Trifolium hirtum

• California Invasive Plant Inventory Assessment Form (pdf) - 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 News - Articles from our quarterly newsletter. Each issue is available as a pdf. List of articles on Trifolium hirtum.
• Cal-IPC Symposium Proceedings - Presentations and papers from our annual Symposium. List of articles on Trifolium hirtum.

Cal-IPC News Articles

• Martus, C. and C. Schneider (2004). Lessons learned after the San Diego County fires. Cal-IPC News. 11: 8-9.

Cal-IPC Symposium Proceedings

• Carrithers, V. F. (1997). Using Transline* herbicide to control invasive plants. California Exotic Pest Plant Council Symposium '97. Concord, CA.
• DiTomaso, J. M. (1997). Risk analysis of various weed control methods. California Exotic Pest Plant Council Symposium '97. Concord, CA.
• Quinn, L., B. Davis, et al. (2006). Does horse manure harbor invasive plants? Cal-IPC Symposium. Rohnert Park, CA.

Other Resources on Trifolium hirtum

• 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.
• CalPhotos - Images of plants taken mostly in California.

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