Photo by Bob Stewart
Grown by Bob and Dee Stewart
Two other photos of this fine species (both grown at the Smithsonian Institution) can be seen here and here. Note the very wide-open throat of this species, in contrast to A. longiflora 'Juaregia', also white-flowered. The open throat of A. dulcis suggests bee pollination; the very narrow key-hole throat of A. longiflora suggest moth pollination.