Hmm, our book shows images of both sexes, but I'm stumped as to what the differences are. They look pretty nearly identical. The plant is Oxypetalum coeruleum (used to be Tweedia caerulea), no common name that I'm aware of, although being such a striking plant you'd think someone would have come up with one.
Thanks Jackie. I remember the name Tweedia now. That's how I'd known it before. Is it an exotic? Re the monarchs, my book's illustrations show a few more dots on the margin of the forewing in males but my phone pics aren't much to go by.
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