The vine rarely produce side branches. If the growing tip was damaged or cut off, a new growing tip will appear at the nearest axil. I had seen this vine in the wild many times but never once had I seen its flower. The numerous bulbils along the stem grow from the axils of the leaves without the need to produce flowers. In January 2014, I got to see a single elongated flower cluster from a plant that grew in my pot. But the flower never opened. I did not know what trigger off the flowering of the climber.
The aerial tubers (bulbils) come in different sizes and some of them can be quite large. The bulbil appeared to undergo a dormant period before it started to sprout a single shoot. It started with an extensive network of roots along the surface of the soil which eventually disappeared when the underground roots developed.
In August 2016, I harvested the bulbils and tubers from a plant had grew in my pot for slightly more than a year. A total of 26 bulbils and 2 mid-size underground tubers were collected. This was the same plant with the sprawling roots shown above.