Quillaya saponaria, Chile Soap-bark.

Botanical name: 
Please read the introduction to Boericke's tinctures.

Produces and cures symptoms of acute catarrh, sneezing and sore throat. Most effective in the beginning of coryza, checking its further development. Colds with sore throat; heat and dryness of throat. Cough with difficult expectoration. Squamous skin
Relationship.--Compare: Kali hyd; Gels; Cepa; Squilla. Saponaria (sore throat, involuntary urination). Senega.
Dose.--Tincture and first potency.

Boericke's Materia Medica, 1901, was written by William Boericke. Excerpt: The Tinctures.