Herb. Obs. A name given by the herbalists to more than one leguminous plant; esp. to Psoralea bituminosa, a native of the Mediterranean and Levantine region.
1562. Turner, Herbal, II. 158 b. The sede and the leaues of triacle clauer, dronken in water, help the pleuresye.
1578. Lyte, Dodoens, IV. xli. 500–1. Of the right Trefoyle, or Treacle Clauer…. The flowers grow from the sides of the stalkes vpon long stemmes,… of a deepe blew or skye colour.
1579. Langham, Gard. Health (1633), 148. Treacle, or garden Clauer … prouoketh vrine and termes, and cleanseth the matrix.
1884. Miller, Plant-n., Treacle Clover, Psoralea bituminosa.
