HerbalGram 116 includes articles on medicinal trees in American forests; ABC begins its 30th year; ABC publishes online version of The Identification of Medicinal Plants; summary of "Adulteration of Essential Oils" chapter from Handbook of Essential Oils, 2nd edition; Asian ginseng berry may lower blood glucose in diabetes and pre-diabetes; petitgrain oil and stress and work performance; ginkgo extract for mild cognitive impairment and dementia; curcuminoids and turmeric extracts for knee osteoarthritis; witch hazel (Hamamelis virginiana) profile; and more.