I think it's coral bells and iris leaves... they look too coarse to be lillies.Our tiger stripe does the same thing in the hostas, those heart-shaped-viney things are next to impossible to kill. Also looks like some corralbelles and lilies.
all our cats are currently sun bathing in the 90 degree driveway.
My calico/tabby mix tolerates the heat better than the dogs. She at least comes out and hangs out with me on the deck. The dogs will go out and do their business, but then they're ready to get back in the AC.