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Rheum officinale Baill. - Polygonaceae
药用大黄 yao yong da huang (hin.), Chinese rhubarb, Canton rhubarb, Shensi rhubarb, Südchinesischer Rhabarber, Kanton-Rhabarber
Large perennial herb, 1.5-2m tall, native to Southwest China, Southeast Tibet, Birma; stem stout, hollow; leaf blades orbicular, 30-50 cm in diam., or longer than wide.
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200006743
The four major hydroxyanthraquinones from R.officinale are chrysophanol, emodin, physcion and aloe-emodin.
[Preparative isolation and purification of hydroxyanthraquinones from Rheum officinale Baill by high-speed counter-current chromatography using pH-modulated stepwise elution. Yang, F., Zhang, T., Tian, G., Cao, H., Liu, Q., Ito, Y., Journal of Chromatography A, Vol.858(1), 1999, 103-107]
