Mojang Forgot

Flowers:

Allium, Azure Bluet, Blue Orchid, Cornflower, Lily of the Valley, Orange Tulip, Pink Tulip, Oxeye Daisy, Poppy, Red Tulip, White Tulip, Wither Rose, Dandelion

Mushrooms and other things:

Brown Mushroom, Red Mushroom, Dead Bush

Seedlings (almost all species):

Acacia, Birch, Cherry, Dark Oak, Jungle, Oak, Spruce