Whilst we are talking about butterfly attractants, I notice that there is one species missing from your threads, which is Caesalpinia pulcherrima, or the Pride of Barbados, or in Malay, Jambol merak or Cana. This species regularly attracts many of the Swallowtails, including the Common Birdwing and also Catopsilia species, or at least it does up here. Indeed, whilst I am typing this, I can see one Troides helena cerberus, two male Papilio memnon, one female memnon f. agenor, one f. distantianus, one P. demolion, two P. polytes and a P. demoleus.