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They can be flat root, fillet root, or major diameter fit. The purpose of this type of spline is to allow for angular misalignment between the shaft and mating detail. This is accomplished by crowning the male tooth. The tooth (usually) has a symmetrical crown about the centerline of the spline face-width.
With my limited machining knowledge, I am finding it hard to understand how they can cut splines inside a wheel hub. At work the other night I removed a wheel from a small powered pallet jack and noticed that the splines inside the hub were all but gone due to lack of proper lubrication. These splines are supposed to mate up with the splines cut in the approx 1 1/2 axle shaft. The splines in the hub are approx 6 long. What kind of tools or machines do they use to cut the splines? It seems like it would be hard to cut anything in such a small diameter hole.........thanks.