Contraction. - Rhe.

Rheum palmatum. Nat. ord., Polygonaceae.

Synonym. - Rhabarbarum.

Fig. - Flora Horn., pi. 50.

Rhubarb. For. names: German, Rhabarber; French, Rhubarbe; Italian, Rabarbaro; Spanish, Ruibarbo.

Habitat. - China, Chinese Tartary, and Thibet.

Part employed. - The dry root as imported.

Characters. - Trapezoidal, roundish, cylindrical, or flattish pieces, frequently bored with one hole, yellow externally, internally marbled with fine, wavy, greyish, and reddish lines; finely gritty under the teeth, taste bitter, faintly astringent and aromatic; odour peculiar. Free from decay, not worm-eaten. Boracic Acid does not turn the yellow exterior brown.

Preparation. - Tincture, using proof spirit.

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

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