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This image shows an Anise swallowtail butterfly (Papilio zelicaon) atop Hardy plumbago (Ceratostigma plumbaginoids). This is an example of butterfly foraging, butterfly’s drink nectar and flowers provide an excellent food source as well provide a great place for them to land. Butterfly’s drink nectar through their proboscis, a long straw like tube, and in the process often pick up pollen from the flower which means there is a chance the pollen will be transferred to another flower to allow reproduction in the flower to take place1. While this is often a symbiotic relationship, the butterfly is provided food while the flowers pollen is spread allowing it to reproduce, in the case of Hardy plumbago it is actually a communalism relationship. Hardy plumbago produce through rhizome meaning they reproduce asexual through their root system producing new shots off the original plant2. So although the plant receives nothing it is not harmed and the butterfly is still able to forage there and obtain the substance it needs.
1.https://www.carolina.com/teacher-resources/Interactive/bees-butterflies-and-flowers/tr33001.tr
2.http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=a542