By Jjulio
Johannesburg,
South Africa 
Appeared in my garden last year... ... and I have quite a few more this year, without knowing the name of this daisy.
Can you help, please?
17 Apr, 2014
Answers
No idea, but it's pretty & I'd be happy to have it appear in my garden!
17 Apr, 2014
Yes, it could be a bidens [bidens alba with traces of yellow? Hope is not blackjacks!...].
Thanks a lot.
17 Apr, 2014
Could it be a coreopsis? How big is the flower?
17 Apr, 2014
Went outside to measure it: 5 centimetres, 2 inches in diameter - not a big flower at all.
17 Apr, 2014
Coreopsis was my first thought
17 Apr, 2014
size is about right for one of the coreopsis species. It has the common name of Tickseed here in Britain. What is the botanical name of Blackjacks?
17 Apr, 2014
Bidens pilosa L. - but its flower is even smaller than this in my garden, and this one does not have the nasty needles that grab your clothes and pierce you.
.
http://www.daff.gov.za/docs/Brochures/BlackjackPG.pdf
17 Apr, 2014
It is then bidens alba, thank you all for replying; much appreciated.
14 Jul, 2018
wow, its over 4 yrs since you asked. hope you have been ok in the intervening years :o)
14 Jul, 2018
Previous question
Could it be a perennial Bidens?
17 Apr, 2014