Pte'lea trifolia'ta, Wafer-ash, Hop-tree, Swamp-Dogwood, Wing-seed, Shrubby Trefoil. -- Root-bark; N. America -- N. Y.-Fla.-Texas; rocky places. Handsome shrub, 2.4-3.6 M. (8-12 degrees) high, branches dark brown; leaves petiolate, light green, trifoliate; leaflets sessile, ovate, short-acuminate, crenulate, lateral ones inequilateral, terminal one cuneate at base, finely pellucid-punctate; root-bark one or more inches long, light brown, wrinkled, with thin epidermis, internally yellowish-white, darker by exposure, odor peculiar, aromatic taste bitter, pungent, acrid; contains berberine (bitter, tonic) tannin, gallic acid, resin. Aromatic, tonic, stimulant, antiperiodic; dyspepsia, low fevers with gastro-intestinal irritation, typhoid conditions. Dose, gr. 15-30 (1-2 Gm.); infusion, 3ss-1 (125-30 cc.); fluidextract. Leaves and young shoots anthelmintic; fruit (samara) aromatic, bitter, good substitute for hop.