I have been telling bloggers in my comments that blue and dark violet flowers are not common in our tropical climate, unlike in temperate climes. When I see them here, my attention will definitely be captured and I will not allow it unphotographed. I am still looking for the scientific explanation why blues appear mostly in cold climates, so they are called cold colors. Maybe more anthocyanins are assimilated there. If that is also correlated with the color of the spectrum absorbed by these plants, i still don't know. I hope there is someone who will give me the thorough explanation.
On the other hand warm colors are really found so common in our warm climate. The reds, orange and yellows are widespread with us. This led me to clamour for the blues. I am so glad when i found this vine growing luxuriantly in our property, as a weed. I know it is a wild yam bean or locally called 'singkamas', Pachyrhizus erosus. The young pods are used as vegetables in the northern parts of the country. But the most commonly eaten are the roots of the more domesticated variety. These roots are also harvested at immature stage, when the vines are still about 1-2 ft tall. When the vines begin to climb, the roots are already mature and not eaten anymore. Literatures say that mature seeds are toxic to humans and animals. The leaves of the wild variety in our property are eaten by ruminants like cattle and goats.
I am so lucky to have volunteer plants like this in our backyard.