Here are two Osmanthus flower: The larger yellow flowers is a four-season type and small silver one, also a four-season type of 'Small Leaf Fodingzhu'.
Here is a link that might be useful:
On ONE plant?
No, there are two plants. If you really want to, you can graft two or three kinds of Osmanthus on one plant. Generally speaking people do not do multiple grafting on flowering plant.
However my pearl tree has two types of pearl.
Long River, that is hard to believe. WOW WOW WWWOOOWWW!!!