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For some unknown reason, almost all are better known than soapwort.

It came from several thick patches of soapwort growing along the edge of the pasture.

Injection of a toxin made from soapwort seeds that targeted these spinal-cord neurons blocked itch responses, but not other sensory responses, suggesting that information about the itch sensation is transmitted along a distinct pathway.

Sap′onin, a vegetable principle, the solution of which froths when shaken, obtained from soapwort, &c.

Pretty pink-flowered rock soapwort doesn't occur north of Germany, according to official ranges published by botanists.