Contractions. - Collin. Csn.

Collinsonia Canadensis. Nat. ord., Labiate.

Synonyms. - Collinsonia scrotina, C. decussata.

Fig. - Eafn. Med., 23.

Stone Root. Common Horse Weed, Rock Weed, Horse Balm.

Habitat. - North America, in moist woods from New England to Michigan and southward.

Flowering time. - July to September.

Part employed. - The root.

Characters. - Stem smooth, simple, round, straight, 1 to 3 feet high; leaves serrate, with broad teeth, pointed, long petioled, only two or three pairs, these cordate at base, broadly ovate, acuminate, surface smooth, with small veins. Flowers opposite, on long peduncles, with short subulate bracteoles, forming a terminal leafless panicle with branched racemes. Corolla two-thirds of an inch long, yellow (exhaling a strong odour like lemons), tubular at base, spreading above in two lips, upper lip very short and notched, lower lip lobed on the sides and fringed around. Stamens two, long, protruding, filaments filiform, anther oval, style protruding. Seeds often abortive, only one ripening. Root perennial, knotty, depressed, very hard, with many slender fibres.

Time for collecting. - In early spring or late autumn.

Preparations. - Tincture, corresponding in alcoholic strength with proof spirit. Trituration.

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

Proper forms for dispensing. - φ and lx, Tincture. lx to 3, Trituration. 1 and upwards, Tincture, Pilules, or Globules.