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.