At the Gardens by the Bay, there are two greenhouse dome attractions that house an array of different plants from various regions of the globe, the Flower Dome and the Cloud Forest. The domes are fairly large and are located near the Singapore River.
Here are some photographs I took of the foliage during my visit.
The Cloud Forest (above) is the larger of the two domes and contains a waterfall, and a multi-level walkway.
(I wasn't supposed to touch the plants, but in my defense, that one flower had fallen).