Anyway, I came across this never seen before plants (Family Acanthaceae) in their beds. Unfortunately, there was no one whom I could ask for the identity.
A link on this mall is shown below:
http://www.queenstreetmall.com/
NB on 13 Nov 12: I suddenly remembered that the unknown shrub here is a Jacobina.
NB on 13 Nov 12: I suddenly remembered that the unknown shrub here is a Jacobina.