Razafimandimbisonia regalis is a species of flowering plant in the family Rubiaceae. It is a shrub or tree.
Razafimandimbisonia regalis is endemic to a single region of south-east Madagascar. The species was described in 1984. It is classified as Critically Endangered by the IUCN.
Taxonomy In 1984, Christian Puff and Elmar Robbrecht described the species, placing in the genus Alberta. In 2009, Kent Kainulainen and Birgitta Bremer moved the species to the newly created genus Razafimandimbisonia.
Distribution Razafimandimbisonia regalis is native to the seasonally dry tropical biome of Mount Vohimavo, in south-east Madagascar. It is found in only one known region, and has an estimated area of occupancy of . It is present at elevations of around .
The species occurs in shrublands, on granite, and in humid forests.
Description Razafimandimbisonia regalis is a shrub or tree. It has dehiscent fruits, and five calycophylls.
Conservation In 2019, the IUCN assessed Razafimandimbisonia regalis as Critically Endangered. The species is threatened by habitat loss, which may be caused by logging and fire. It is not known to occur in any protected area.
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