Annacy'clus Pyre'thrum, Pyrethrum, Pellitory (Root): -- The dried root, U.S.P. 1820 - 1910; N. Africa, Algeria - high lands, cultivated in gardens. Procumbent perennial, resembling chamomile, .3 M. (1 degree) high, with 1 large terminal flower; leaves doubly pinnate, pale green; flowers, April-June, 2.5 - 4 Cm. (1 - 1 3/5') broad, rays white above reddish-purple below, disk yellow; fruit obovate achene. Root, tapering, in pieces 2.5 - 10 Cm. (1 - 4') long, 5 - 20 Mm. (1/5 - 4/5') thick, dark brown, furrowed, wrinkled; fracture short; bark with 1 - 2 circles of resin ducts, closely adhering to yellowish radiate porous wood in which occur 1 - 3 rows of resin ducts; odor distinct; taste sweetish, pungent, very acrid, tingling, sialagogue effect. Powder: Brownish - masses of inulin, fragments of woody tissue, stone cells, cork, tracheae, parenchyma; should be kept in tightly closed containers; solvents: Alcohol, boiling water partially; contains pyrethrine (activity), brown acrid resin (containing pellitorin), 2 potassa-soluble acrid fixed oils, inulin 50 p.c., tannin, volatile oil, gum, ash 3 - 5 p.c. Irritant, rubefacient, sialagogue (prickling sensation to tongue and fauces with heat, pungency), sternutatory - poisonous; masticatory - headache, rheumatism, neuralgia, toothache (tincture or extract as an anesthetic in carious teeth), paralysis of tongue or throat, relaxed uvula, chronic catarrh. Dose: 3ss-1 (2 - 4 Gm.). Tincture: 20 p.c., 3ss-2 (2 - 8cc.); Fluidextract, 3ss-1 (2 - 4cc.). Decoction: Extract (alcohol), Gargle. A. Officina'rum, German Pellitory - annual variety, cultivated in Saxony, Bohemia, Prussia, near Magdeburg, having root 6 Mm. (1/4') thick; bark with 1 circle of resin-cells, medullary rays without resin-cells.