Where can I buy
By Maureeno
West Sussex,
United Kingdom 
Im hunting for an Impatiens niamniamensis,Ive been to your garden centre and they list only one indoor plant, help!!!
15 Aug, 2009
Duchy of Cornwall Nursery sells it, if you go to their online shop. Failing that, use the RHS Plantfinder, and it comes up with some other nurseries.
15 Aug, 2009