This species has long been in wide distribution, but has not yet been identified as to its actual species identity. Apparently collected in Vietnam, it was acquired by the Smithsonian Institution in 1998 and given the collection number 98-083.
The plant is an unusual Primulina in several respects, not least of which is its stoloniferous habit. In this picture, and in the foliage photo linked below, the apparent foliage “crowns” are really stolons that have been truncated at a plantlet, allowing each of these foliage clusters to develop into an apparent rosette, as if it were a truly branching plant.
These stolon crowns are readily rooted, making the species easy to propagate — perhaps underlying its wide distribution.
Additional photos can be seen in a slideshow by clicking the links below.