What type of barrel cactus is that ? day lilies can survive 115 degrees Fahrenheit .

The cactus in question is Ferocactus wislizeni, "the fishhook barrel cactus, also called Arizona barrel cactus, candy barrel cactus, and Southwestern barrel cactus." Apparently, a rather common cactus. I found a study from the early eighties that found its incredible heat tolerance.

And thanks for mentioning the day lily. I might have to look into it.

Here is a link that might be useful: Ferocactus wislizeni

There is a pine tree known as the "jack pine " from California I think , that has pine cones that will not open until it is 135 degrees Farenhieght . These seeds are the sole food of a bird callled the Jackpine warbler .

Cycads like Dioon edule are very heat and sun-tolerant. They grow well in the deserts of Mexico.

There is a pine tree known as the "jack pine " from California I think , that has pine cones that will not open until it is 135 degrees Farenhieght . These seeds are the sole food of a bird callled the Jackpine warbler.

That's a common thing is fire-prone ecosystems, actually. Doesn't mean it routinely gets 135 degrees in its habitat. Just means the cones won't open until right after a forest fire, which enriches the soil with nutrients and thins out the competition for new pine seedlings.