B.vulcanicola
B. vulcanicola is still a very little known Brugmansia. It is native to the volcanic slopes of southern Colombia where it occurs at altitudes of around 3000 metres. The flower shape is similar to that of B. sanguinea, but at 0.5-1.5 cm, it has the shortest fringe of all Brugmansias. The strong crown wall gives the flower a long shelf life (up to a week).
As can be clearly seen in the pictures provided by Dirk Wenzel, the colour gradient is different from that of B. sanguinea, from green (covered by the calyx) to red to yellow.