Monarch butterfly and friend on yellow flower

I was walking beside the Thorp Drain looking for pukeko chicks. This yellow flower looked so bright in the sun I had to blip it. Just as I did look what flew in. A monarch butterfly with a small friend. I suspect the butterfly disturbed the small insect.
If you can tell me the name of the flowering shrub would be grateful. I thought a hebe but possibly an australian native.