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Listerblossom is a native plant that comes in several varieties. It's sold in cities, but most country gardens have some growing, and Healers always have a good crop in their herb gardens.
The type used for a pain-killer has bright blossoms of varying hues. The blossoms make a very effective but quite astringent tea, the effect being a muscle relaxant (women are usually given listerblossom tea during childbirth [1]). Most prefer the leaves when tender and new; these leaves, steeped, make a refreshing drink that smells fresh and clears the sinuses. Both are used for headaches. Used in conjunction with steeped willow bark, listerblossom tea will break a fever, though the cost is sweating and thirst. It's thus always followed up by cold water when used as medicine.