Waaaaaaaaay back in the earliest days of the blog, long, long ago in the mists of last November, I did a post on Bryophyllum daigremontianum, and among many, many other things I said, I said this:
Another thing we can notice from this picture is that there seem to be two different kinds of plant here: one with sharply pointed leaves, and one with rounded leaves. (If you're having trouble seeing it, the two largest plants in the picture are the pointed kind, and the ones in the right top and right bottom corners are rounded.) I think that these are different morphs of the same plant (in which case it's also a master of disguise!), but I haven't bothered to let them grow out to check. I do know for sure that the rounded-leaf type will eventually grow up to develop spots and serrated edges, because I did grow one of those out, by itself, to see what it would do. So if anybody knows for sure that Bryophyllum daigremontianum is (or isn't) capable of changing its appearance like this, let me know. If not, I will be forced to grow out one of each and see what happens.
And then I completely forgot about this, because, frankly, it wasn't the most interesting of questions, and then I had a blog to photograph barns with, plants that needed to be written, and a husband to water, and there was this whole big thing. But, owing to the work policy of forgetting the hell about the cactus and succulents once the annuals began arriving, some of everything grew out anyway, et voilà --
This is the plant that results if you let the pointy leaves grow out on their own. I don't know what it is, but it's not Bryophyllum daigremontianum, a.k.a. Kalanchoe daigremontiana. (Anybody have an ID?) And now we know.