α-Amyrin, lupeol, and a new triterpene alcohol, simiarol, have been isolated from the leaves of Rhododendron simiarum; α-amyrin, β-amyrin, and lupeol have been isolated from the leaves of R. westlandii ; and epifriedelanol has been isolated from the leaves of R. championae. This paper completes the chemical survey for triterpenoid and flavonoid compounds of the endemic species of the family Ericaceae of Hong Kong.