When you cast the spell summon monster, does the summoned creatures alignment affect the spell description for the school?
So would a good cleric be allowed to summon a Lemure from SM2 which is a lawful EVIL creature?
The spell summon monster I (et al.) says, "When you use a summoning spell to summon a creature with an alignment or elemental subtype, it [the summoning spell] is a spell of that type." Hence, for example, a lemure's alignment subtype is evil (and, technically, lawful), so when summon monster II would be used to summon a lemure, that summon monster II spell would gain the evil (and lawful) descriptor, and the spell couldn't be cast to summon a lemure by a good (or chaotic) cleric.