This small and delectable species is named after Sir George King, head of the Royal Botanical Garden in Calcutta during late 1800s. There are lavish photos of 2 forms of this plant in Ruth Kiew's brilliant book "Begonias of Peninsular Malaysia" - one showing nicely variegated round leaves and the another very dark indigo leaves of similar shape but bearing crimson flowers instead of white/pink. There are other forms available and most of them have peltate, thick, dish-like leaves that feel like plastic to touch.
During a recce trip I found this rather unique form that had long drooping leaves with angular margin and a tapering drip point. Each dark coloured leaf has 5-6 light bands radiating from the centre - its quite distinct from the forms shown in Ruth's book. I observed that this plant is very exact in its requirement, preferring dark, humid limestone cliffs and forming patches of dense vertical cover on a particular hill, yet apparently absent at neighbouring hills.
This species is endemic to west Malaysia and is closely related to the extinct B. eiromischa.