Contractions. - Ptel-t. Pt-t.

Ptelea Trifoliata. Nat. ord., Rutaceae.

Wafer Ash, Wingseed, Shrubby trefoil, Swamp Dogwood, Hop-tree.

Habitat. - Rocky and shady places, moist hedges, skirts of woods; North America, from Pennsylvania to Wisconsin, and southward.

Flowering time. - June.

Part employed. - The bark.

Characters. - A shrub from 6 to 8 feet high, with leaves trifoliate, and marked with pellucid dots; the leaflets are sessile, ovate, short, acuminate, downy beneath when young, crenu-late or obscurely toothed; lateral ones inequilateral, terminal ones cuneate at base, from 3 to 4 1/2 inches long, by from 1 1/4 to 1 1/2 inches wide. The flowers are polygamous, greenish-white, nearly half an inch in diameter, of a disagreeable odour, and disposed in terminal corymbose cymes. Stamens, mostly 4; style short; fruit a 2 celled and 2 seeded samara, nearly 1 inch in diameter, winged all round, nearly orbicular. The bark, when dried, is in cylindrical rolls or quills, 1 or 2 lines in diameter, and from 1 to several inches long, of a light brownish colour, irregularly wrinkled, and covered with a thin epidermis. Internally it is yellowish-white, but darkens by exposure. It has a peculiar, somewhat aromatic smell, and a bitter, persistently pungent, and slightly acrid, yet not disagreeable taste, and yields its virtues to water, but more readily to alcohol. It contains an oleo-resin and an alkaloid (berberine).

Preparation. - Tincture, using rectified spirit.

Reference to Horn. Proving. - Hale's New Remedies.

Proper forms for dispensing. - φ and upwards, Tincture, Pilules, or Globules.