Synonyms: Cape Weed, Capeweed
From Wikipedia: Arctotheca calendula is a plant in the sunflower family commonly known as capeweed, plain treasureflower, cape dandelion, or cape marigold because it originates from the Cape Province in South Africa. It is also found in neighboring KwaZulu-Natal.
Arctotheca calendula is naturalized in California, Spain, Portugal, Italy, Australia, and New Zealand, and considered a noxious weed in some of those places.
Images: Forest Starr & Kim Starr, CC-BY Creative Commons Attribution License 3.0