That's the list without turning off the C3D ghost items.
Once you hide the C3D items, the list is a lot shorter (13 items as mentioned by alexcoppo) :-

Red Coral
Dry Bush
Patch of Grass
02fReed
Tropic
Cactus
Chameleon's Carrot
Booba Fingers
Z-Megaspore
Dead Tree
Plum Tree
Springtime White Birch
Coconut Tree