1811 A. T. Thomson iii. 610 Macerate the jalap root in the spirit for four days.
1865–72 H. Watts III. 436 Spurious, woody or fusiform jalap, jalap-wood, or jalap-stalks,..the root of Convolvulus orizabensis, is sometimes mixed with genuine jalap.
1866 J. Lindley & T. Moore I. 484/1 E[xogonium] Purga..furnishes the true Jalap tubers of commerce.