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It is hard to tell from the picture as the female flower is just opening.
can be seen to have two stigmas, confirming C. nigra.
I can see some with three.
I am not convinced that there are only two.
Need to bend the bend flower or remove some for photography e.g. http://www.ispot.org.uk/node/260058
I cannot see any clear 3s. There are pairs that are close together, and on examination at highest resolution on a big (26 inch) monitor 3s look more like 4s.
In any case, this seems to me to be absolutely typical C. nigra on general appearance - inasmuch as "typical" means anything in the C. nigra group.
Fair enough; just checking. Martin
Lat/Lng: 54.446, -3.0137
OS grid ref: NY343060