Contraction. - Rhs.

Rhus toxicodendron. Nat. ord., Anacardiaceae.

Synonym. - Vitis Canadensis.

Fig. - Flora Horn., pl. 51.

Poison Oak, Poison Ivy. For. names: German, Giftsumach; French, Sumac Vencnoeux; Italian, Rus Toxico-dendro.

Habitat. - North America. -

Flowering time. - June and July.

Parts employed. - The fresh leaves, collected at sunset and never exposed to the sun.

Characters. - Leaves on long petioles consisting of 3 leaflets, of ovate or rhomboidal form, pointed, strongly veined, glabrous on upper surface, but more or less downy underneath, margin serrated.

Time for collecting. - May and June, before flowering.

Preparation. - Tincture, corresponding in alcoholic strength with 40 O.P.: spirit.

N.B. - As the plant is not indigenous to this country, the tincture imported from North America must be used.

Reference to Horn. Proving. - R. A. M. L., ii.

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