Certainly something odd about those "variants". I suppose that since M. melaleuca and M. baumii are in the Dlocothele subgenus then they are pretty close. The fact that they are also close geographically is interesting.
But don't say too much or some English botanist will lump them together.
And for further comparison, here are a couple of photos of the M. melaleuca that I saw last year.
First one in bud, north of Palmillas:
and again, a multi-headed one at the same location:
We also found it sw of Jaumave, but for some reason it seems that I didn't take its photo!