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Leaflets of P. obliqua, bitter, and of a distinct odour, have been found to be mixed with Buchu.
---Constituents---Of the tuber, 70 per cent starch and 5 per cent of a new sugar not yet fully investigated. The root of the Virginian variety contains a volatile oil of pungent taste, and a bitter principle, not tannin. The Indian P. corylifolia yields a useful oleoresin.
---Medicinal Action and Uses---P. glandulosa, or yolochiahitl, has a leaf included in the Mexican Pharmacopceia as a tonic or anthelmintic, and an emetic root. P. bituminosa of Europe and P. physodes of California are tonic and emmenagogic. The root of the Virginian variety is a valuable, aromatic tonic, useful in chronic diarrhoea, while the Indian species is useful for leucoderma and other skin diseases.
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