Aren't those the cutest things?! You're a total addict now, Caroline! TY for sharing them.
Obtusifolia = blunt leaf.
Magnolifolia = magnolia-like leaf.
This page translates many of the Latin names to what they mean in English, with some pics.
http://succulent-plant.com/fam...
If they came from Exotic Angel/Costa Farms, you should be able to sort them from their line-up:
http://www.costafarms.com/plan...