pareira

In the root the active substance usually resides in the bark, sometimes in the parenchyma that envelopes the woody tissue and rarely in the woody tissue itself, as, for example, in "rhubarb" and "pareira brava."

The Medicinal Plants of the Philippines Jerome Beers Thomas 1891

For three months in the beginning of this year she had been under the care of Dr. Darwin, who at different times had given her blue vitriol, elaterium, and calomel; decoction of pareira brava, and guiacum wood, with tincture of cantharides; oxymel of squills, decoction of parsley roots, &c.

An Account of the Foxglove and some of its Medical Uses With Practical Remarks on Dropsy and Other Diseases William Withering 1770

Our patient being thus snatched from impending destruction, Dr. Darwin proposed to give her a decoction of pareira brava and guiacum shavings, with pills of myrrh and white vitriol; and, if costive, a pill with calomel and aloes.

An Account of the Foxglove and some of its Medical Uses With Practical Remarks on Dropsy and Other Diseases William Withering 1770