The plant shown by Maurillio is indeed M. guerreronis, and it is flowering extremely well (I thought that they flowered with difficulty, but this one does a really perfect job). My seedling guerreronis plants are still a bit too small to flower, hopefully they will flower next year.
The plant shown by Barbara is certainly not M. guerreronis, it could be a member of the M. supertexta/M. dixanthocentron family. I would give it more light though, it is somewhat etiolated.
Ciao und Grüsse,
Wolter, Assen, The Netherlands.