Rhodanthe Rose

Origin
Darwin was a peaceful and small town which was in a strategic location but held little in value so not a high target in WWII. That didn't stop the Japanese bombers from attacking the town, over half of the civilian population fled south, the other half were killed.

Effects
Blood from countless casualties soaked the ground, seeping into the roots of the normally peaceful Australian Rhodanthe corrupting and twisting the flower into something wicked to the point where the thorn less flowers grew thorns that contains deadly poison that causes instant death.