How Do I Know What Kind Of Christmas Cactus I Have?

How Do I Know What Kind Of Christmas Cactus I Have? The difference between the three cacti is found in the shape of the leaves. The Thanksgiving cactus (Schlumgera truncata) has very pointed and claw shaped projections on the edges of the leaf. The Christmas cactus (Schlumgera bridgesti) has leaf projections which are more scalloped