Oh great, thanks. I'm trying to learn them but finding it quite challenging. I fear that I'm probably pulling out good ones while pulling madagascarensis!
I doubt it. The only really similar native Senecio grows either on coastal cliffs/dunes or up on the escarpment round swamps. So if you wait to see a yellow flower head (hispidulus has no "petals"), and avoid the large, almost shrubby S. linearifolis, then you are probably just getting the weedy one (and my god how weedy it is, in this post-drought spring).
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