Yellow swan Impatiens

....what did I tell you, its a yellow swan .....

A shrubby Impatiens from Indochina that grows up to about a metre tall. It has bullated leaves arranged in a circular whorl.  Probably affiliated to Impatiens claviger / parviflora group but has a rather short spur. This group is found in the cooler northern Vietnam and south Yunnan/GuangXi area of China.

This plant is very floriferous and grows surprising well in our tropical climate. However, it needs very high humidity, otherwise the leaves will droop and become flaccid.

As of now, I have no clue what-so-ever of its identity. Any suggestions will be appreciated.