Excerpt - page 124: "... of them are endowed with edible properties. The best-known cultivated plants among the Polygonaceae are buckwheat and rhubarb. ..."
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Excerpt - page 24: "... In addition to recipes for purgatives (including castor oil, rhubarb, aloe and senna), some toxic plants were mentioned: henbane (Hyoscyamus), pomegranate (Punica granatum) and poppy (Papaver ..."