Occasional.
Clusters of stamens or galls?
Common to abundant in park.
Occasional throughout park, but locally abundant in places.
I think. Two different plants included, but found within 10 ft of each other.
Occasional.
Common to abundant throughout park and in adjacent areas.
Common to occasional in certain areas. Cultivated in some parts of park, but this plant appeared "wild."
Uncommon/rare.
We were uncertain whether this was planted or self-established, so I will assume the latter for now.
In dense patches growing along shores of this pond. Not observed at the other.
Occasional around pond.
Last three photos of adjacent plant in fruit.