I'd been noticing these leaves at Lyon Arboretum in Honolulu, and decided they were Ipomoea when I finally saw them with these flowers. But now I notice the hibiscus flowers in this photo with what I thought were the same leaves, and I can't tell if the flowers are growing on the same plants as the leaves. If they're really Malvaviscus penduliflorus, then the leaves would not look like this, but I know there are some hibiscus with palmate leaves. So the question is: are these flowers a red herring and are these plants the same as the ones above? Or do the yellow flowers on the vine not go with the leaves above?
The yellow one could be Merremia tuberosa: http://wildlifeofhawaii.com/flowers/900/merremia-tuberosa-woodrose/
Thanks, Andrey. I remember seeing the wood rose "rose" on David Tarrant's tour of Hawaii in 1980; I've seen very few of them since then and have been back to various islands several times since. So I'm excited to finally notice what the plant looks like, as I didn't pay attention to that at the time. I see that Ipomoea tuberosa is a synonym. It's native to tropical America, is invasive in Hawaii, described at hawaiianinvasivespecies.org as an "aggressive vine that chokes and smothers plants". Maybe that's what it's doing to that nice hibiscus. Or maybe the hibiscus is invasive as well.
