Dimorphotheca ecklonis (Cape marguerite, Van Staden's River daisy, Sundays River daisy, White daisy bush, Blue-and-white daisy bush, Star of the Veldt; syn. Osteospermum ecklonis (DC.) Norl.) is an ornamental plant. A native plant of South Africa, this plant is now regarded as a weed in parts of Australia, particularly Victoria and Western Australia.
Description taken from Wikipedia: http://en.wikipedia.org/wiki/Osteospermum_ecklonis