In the PHB page 202 under the bonus action heading it states:
You can't cast another spell during the same turn, except for a cantrip with a casting time of 1 action.
This seems to state that if you cast a bonus action spell, you could not cast a reaction spell in the same round.
That is to say, there is no limit to how many spells you could cast in a round (action economy willing) as long as you don't cast a bonus action spell.
Is this correct? What is the maximum number of spells that a character could cast in a round? Does anyone know the reasoning to exclude casting both a bonus action spell and a reaction spell in the same round?