Nat. ord., Euphorbiaceae.

Queen's-root, Queen's Delight, Yaw-root, Silver-leaf.

Habitat. - In pine-barrens and sandy soils from Virginia to Florida, and in Mississippi and Louisiana.

Flowering time. - April to July.

Part employed. - The root.

Characters. - A perennial plant, with herbaceous stem 2 to 3 feet high, yielding when wounded a milky juice. Leaves alternate, sessile, oblong, or lanceolate, obtuse, serrulate, tapering at base, and accompanied with stipules. Male and female flowers on same plant, yellow, and in the form of a spike, the upper part being occupied by the male, the lower by the female. The male florets, scarcely longer than the bracteal scales. Hoot large, thick, and woody, in long cylindrical pieces, one-third of an inch to an inch or upwards in thickness, wrinkled when dried, externally of a dirty yellowish-brown-colour, when cut across exhibiting an interior soft, yellowish} ligneous portion, surrounded by a pinkish-coloured bark. It has a slight peculiar, somewhat oleaginous odour, which is strong and acrimonious in the fresh root, and the taste is bitterish and pungent, leaving an impression of disagreeable acrimony in the mouth and fauces. It imparts its virtues to water or alcohol, and deteriorates in activity by age. Its properties appear to be owing to a very acrid oil.

Preparation. - Tincture, corresponding in alcoholic strength with proof spirit.

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

Proper forms for dispensing. - φ and lx, Tincture only. 1 and upwards, Tincture, Pilules, or Globules.