| Cascara (Rhamnus purshiana) | Hydroxyanthracene constituents |
| Eyebright (Euphrasia officinalis) | Iridoids |
| Plantain (Plantago major) | Iridoids (much less than senna) |
| Yellow dock (Rumex crispus) | Hydroxyanthracene constituents |
| Buckthorn (Rhamnus frangulara) | Hydroxyanthracene constituents |
| Butternut (Juglans cinerea) | Hydroxyanthracene constituents |
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