@Baja_Costero
Very cool, Baja!
This is an example of what is called "fasciation." Normally, when a new shoot is growing, the very tip of the shoot where the cells are actively dividing is like a little "point" that forms a cone and then the cone lengthens into the stem. You can see several normal stems all around the plant in your picture above. With fasciation, the "point" of dividing cells is instead a "line" of cells, and they end up forming what appears to be several stems fused together---the central structure in the image above and in the banner image.
Flower heads can be fasciated, too.
Lots of plants can develop fasciated stems or flowers, often only on occasion, but some plants commonly do. Crested celosia (cockscomb) is one many folks are familiar with:
Many things can trigger fasciation: weather, viruses, bacteria, chemicals, genetic mutation. Often the cause is unknown.
I did a little looking around for more info on fasciation for those of you interested:
Here is a good article on fasciation:
https://mastergardener.extensi...
Some good pictures of "normal" and "fasciated" Euphorbia flanaganii (also called "medusa head"
https://succulentgrowingtips.c...
A couple more fasciated plants:
https://www.canr.msu.edu/news/...
