Drosera rotundifolia
According to D.H. Paper, "et al.", "Drosera rotundifolia" plant extracts show great efficacy as an anti-inflammatory and antispasmodic, more so than "D. madagascariensis", as a result of the flavonoids such as hyperoside, quercetin and isoquercetin, but not the naphthoquinones present in the extracts. The flavonoids are thought to affect the M3 muscarinic receptors in smooth muscle, causing the antispasmodic effects. Ellagic acid in "D. rotundifolia" extracts has also been shown to have antiangiogenic effects.