In the very little wandering that I did at the LA Arboretum I came across this yellow trumpet bush (tecoma stans).
It was all literally all abuzz. I saw three kinds of bee, honey, carpenter and one tiny one I think might be a small carpenter bee. The larger bees cheated. Instead of going into the flowers and doing their work as pollinators, they chewed through the base of the flower and drank the nectar from there.
You can see the hole in the top flower in the picture below as well as a bee drinking from the outside of the flower.
The only one I saw actually go into the flowers was this little bee
. There were hummingbirds, but they didn’t seem interested in this plant.