Nematanthus sp. "albus" Chautems ined
Photo by Leslie Brothers,
copyright Smithsonian Institution
Grown at Smithsonian Institution greenhouses
This plant has been widely distributed with the descriptive name 'Santa Teresa', and as N. albus. The latter name is generally accepted, although it appears not yet to have been formally published as such. Other photos can be seen here, here and here. Similar plants, but of different species, can be seen here and here.