Calling a function with a same name as a parent class function pointer

I'm trying to get a variety of Nodes to run a defined execute function that is passed in to a constructor and stored (and called) from a function pointer variable.

class Node{
    std::string(*execute)();
};

Node::Node(std::string(*funcPointer)()){
    execute = funcPointer;
}

I also have several derived classes that all also have an execute funcion

class redNode : public Node{
    std::string execute();
};

std::string redNode::execute(){
    return "I'm red";
}

class blueNode : public Node{
    std::string execute();
};

std::string blueNode::execute(){
    return "I'm red";
}

Then, I want to call all of the Node's execute functions.

std::string myFunc(){
     return "my Func";
}

Node mynode = new Node(&myFunc);
//other instantiations here...

myRedNode.execute();
myBlueNode.execute();
myNode.execute();

However, trying to call .execute() of myRedNode or myBlueNode doesn't work because the execute variable that's a part of the parent class was never set and it seems to be calling that. Trying to then set the execute variable

myBlueNode.execute = &BlueNode::execute;

gives a error C2659: '=' function as left operand, even when I rename the function I'm setting the variable to.

How do I solve this problem? How do correctly call function with a same name as a parent class function pointer?

via Chebli Mohamed