Items like: flowers, monster eggs, glass panes, carpets and tall plants are called the same in a ID. Example: all the tulips are called minecraft:red_flower. So...yeah
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Here's a great place to look them up I have linked to Dyes as a good example: http://minecraft.gamepedia.com/Data_values#Dyes
There are many other item types like this. One value determines the item base type such as a bottle, while other tags determine the sub-type of the item. This allows one model with multiple texture/values.