Can't see the the plant very well so it may be some other kind of thistle or wild lettuce, but I believe it is Tasselflower (a.k.a Cupid's Shavingbrush). See here and see if you agree.
http://uswildflowers.com/detail.php?SName=Emilia%20fosbergii
I've seen a lot of these in Hawaii and I also believe they are regarded as weeds. I've no idea what it is, so I'm intrigued to see what someone comes up with.
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