amaranthine

Long ago poets conceived of a flower that did not fade and christened it amaranth. The appellation is rooted in the Greek word amarantos, meaning "immortal" or "unfading," and amarantus, the Latin name of a flower (probably Celosia cristata). The word amaranthine emerged as an adjective of the imaginary flower and subsequently of anything possessing its undying quality. Amaranth also names a real plant (genus Amaranthus), an herb that some consider a weed and others grow for its colorful leaves and spikes of flowers.