Here is another very tall Prunus that I found today, this one is near the Park Entrance.
It's so tall, I couldn't reach the flowers, even with a stick. All the flower just started to open....
There are a thicket of P. rivularis growing next to this very tall Prunus.
There is another tall Prunus nearby, but I couldn't get closer for a picture.
The last picture is a cellphone picture, P. rivularis thicket is on the right hand side. They are much shorter than this tree.
Here is one of three big trees.
This one seems dead, but with new growths emerging from the dead tree trunk.