Family: Polygonaceae.

The comminuted root of Rheum Rhaponticum, L. (family Polygonaceae) yields upon distillation 0,0041 p.c. of an intensely yellow, concrete oil that melts at 25,5°. It contains chrysophanic acid: m. p. 158°5).

1) Jahrb. f. prakt. Pharm. 19 (1849), 71.

2) Repertorium f. d. Pharm. III. 7 (1851), 1.

3) Jahrb. f. prakt. Pharm. 26 (1853), 65.

4) Handelsbericht von Gehe & Co. 1910, 150.

5) H. Haensel, Apotheker Ztg. 17 (1902), 498.