Osteospermum calendulaceum

Photo: Ron Vanderhoff

Synonyms: Oligocarpus calendulaceus, Osteospermum parviflora, Calendula parviflora

Osteospermum calendulaceum (family Asteraceae) is a yellow-flowered annual to short-lived perennial plant that is native to the Cape region of southern Africa. It was first detected in the continental United States in Orange County, California, in 2022. Osteospermum calendulaceum and has also been introduced into Hawaii, and Australia, where it does not appear to be as aggressive. A novel plant in California, its local ecology and environmental impacts are still largely unknown. Plants are short-statured, highly branched, weakly ascending to procumbent and have glandular pubescent hairs.  This species has been observed to have nearly year-round flowering, an affinity for drylands habitat, and an ability to form large stands quickly.  More study is needed on its biology, ecology, and invasive potential of this species in California.

Cal-IPC Rating: Watch

CDFA Rating: A?

Assessment(s)

Plant Risk Assessment - An evaluation of the potential for a plant to be invasive in California.

Weed Management Notes

No Weed RIC Management Notes are available for this species. Check for information on other species in the genus on the Weed RIC site.

Cal-IPC Newsletter Articles

There are no newsletter articles associated with this species yet.

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.

There are no Symposium presentations associated with this species yet.

Other Osteospermum calendulaceum Information

  • CalPhotos - Images of plants taken mostly in California.
  • Calflora - Distribution map and records of this species in California.
  • GBIF - Global distribution information.