The new flowers show up as one (because they have data values; 1 block tall flowers use block ID 38 and 2 block tall flowers use block ID 175) and use the names 'tile.flower2.name' for the 1 block tall flowers, and 'tile.doublePlant.name' for the 2 block tall flowers. This also happens to the Dandelion, which shows up as 'tile.flower1.name', however, the Dandelion has its own data value (block ID 37).
Notice in the screenshots I placed 9 tile.flower2.names and 6 tile.doublePlant.name, the same amount of new flowers added to the game.