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Literally "Muslim Vinegar." This name refers to the Sumac tree (genus Rhus). Historically, the tart berries were used as a souring agent in Middle Eastern and Central Asian cuisines, leading Chinese observers to associate the plant with the "Huihui" (Muslim) people.
Trees, Volume 35
The accompanying illustration shows a botanical specimen of the Sumac tree. It features a branch with pinnate leaves—leaflets arranged on either side of a stem—with distinct serrated or "saw-tooth" edges. Next to the foliage is a separate study of the tree trunk, highlighting the deeply textured, cracked bark, which is a key identifying feature for collectors and woodworkers.