The yellow flower looks like the one of DANDELION?
I don't think it is dadelion though it looks like it first sight. The leaves look like a thistle to me. My guess is something more like Pilosella officinarum, (http://www.nzpcn.org.nz/flora_details.aspx?ID=4047), but I am not an expert. The dark filaments don't look like anything I have come across though....
HERE ARE MORE PHOTOS ON ITS LEAVES, PLEASE.
Helminotheca echioides
Thanks Mike. http://www.nzpcn.org.nz/flora_details.aspx?ID=3025
Thanks Andre and Mike.
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