Absolutely agree that the Lily and Moonvine would not cross. The elephant/fish analogy was right on. Or pigs might fly, too .. ?
I keep thinking that the Brugs and Daturas must be crossing somewhere. I have brugs with flowers that hang straight down, Daturas with flowers that face upwards, and several brug crosses from various trades and unknown parentage that have flowers that face sideways . . . I don't know
But I know there are lots of people messing around with crossing them. They ain't cheap, but they are easy.
Anne, is that a stinkhorn mushroom in your avatar? Pretty one, but I'd get rid of it before it starts to, y'know, STINK! They really smell like rotting corpses.