No need to be sarcastic.
It's just a very very common flower, red ginger. I'm looking at one outside my window right now. >>> WTF? Turtle?
The one on the beach in Across the Sea. Fans were coming up with all sorts of reasons why it was mythological, why it was in one shot and then disappeared, and so forth. Obsessing about the tortoise.
Enough so that the Final Podcast dealt with "what is the significance of the tortoise on the beach? Cuse explained that it had crawled out of the water and they aren't allowed to touch or move them, and that is the only reason it was in the scene.
I think it's the same with the red flowers. They are shooting at Kualoa Ranch and there happens to be red ginger growing. If it meant anything they would doubtless stick the flowers in a big painting and show it in the background, to be sure that we get the symbolism.
I said turtle because it is a sea turtle, not a tortoise, which I know not because I know everything but because I live around them. They are an endangered species. There are no tortoises in Hawai'i. Not that it matters to you or to the writers.