ElPolloDiablo, perfect! Just what I was looking for, although I'll need to brush up on terminology. That makes sense, having each half of the leaf arising from two daughter cells (I think that's what you said).
But the plot thickens. Now there is an entire stem (leaf?) with leaflets that have this characteristic. It's the only one on the plant. So, the genetic change occurs apparently in each leaflet. ?? That is, how did each leaflet daughter cell inherit the same mutation?? Is it the leaf (stem) itself that carries the daughter cells, and if so, why did my other example have only a single leaflet that inherited the mutation??? Strange.
