273. Ptelea trifoliata.—Wafer ash.
273. PTELIA TRIFOLIATA Linné.—WAFER ASH. Shrub growing in the United States east of the Mississippi. (Root-bark.) It contains berberine. Used as a tonic and antiperiodic, "its mild, non-irritating properties rendering it especially valuable in low fevers attended with gastro-intestinal irritation; this soothing influence causes it to be retained when other tonics would be rejected." Dose of fluidextract: 15 to 30 drops (1 to 2 Mils).