Sentence:  [F]rom the mixture of "blue" and "ſcarlet" are form'd <WSD>"amaranth</WSD>", "violet", and "panſy"; from the ſame mixture of "blue" and "crimſon red" are form'd the "columbine" or "dove Colour", "purple", "crimſon", <WSD>"amaranth</WSD>", "panſy" and "crimſon violet". 
Meaning of the word marked with <WSD> tags:  The characteristic purplish-red colour of the flowers or leaves of these plants.