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COCA is indigenous to South America. The different botanists disagree as to which exact family it should be assigned. Linnæus, De Candolle, Payer, Raymundi of Lima, Huntk, and others, place it in the family of the Erythroxyleæ, of which there exists but one genus, the Erythroxylon, while Jussien adopts another classification and places it in the family of the Malpighiaceæ (genus Sethia). Lamarck, on the contrary, believes that this plant should be classed among the family of Nerprem (Rhamneæ).