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(A) PCA on four species of Sceletium. (S. rigidum; S. emarcidum; S. tortuosum and S. strictum); (B) Supervised PLS-DA on four species of Sceletium; (C) PCA bi-plot of phytochemicals contributing to separation among four species of Sceletium; (D) PLS-DA loadings plot of phytochemicals contributing to the separation; (E) Heat map of phytochemical distribution among four Sceletium species generated using selected chemical markers.
