TRUMPET FLOWERS (?)

When I first saw these blooms at somebody's garden, I was captivated by them. They were larger than any flowers I had ever seen, and the owner told me that they were called 'trumpet flowers'.  Indeed, they looked like trumpets because of their shape.  I asked for cuttings in exchange for my own plants, but unfortunately they did not grow.  Fortunately however, my friend's did and I am now a proud owner of a blooming pot of trumpet flowers.  I may have to move them out of the pot soon, and plant them in the garden.  They seem to love the sun.

I have looked up pictures of trumpet flowers on the internet, but I have not seen any pictures that are similar to these, so maybe they're not the real trumpet flowers.   Here are pictures that I took today.  

PS.  I discovered that they turn more yellow with each passing day, and each bloom lasts more than a week!