1785 T. Martyn tr. J.-J. Rousseau xiii. 149 Lolium or Darnel, has a one-leafed involucrum, containing one flower only.
1821 S. F. Gray I. 124 Gamo-sepaled, one-leafed... Two-sepaled, two-leaved... Many-sepaled.
1994 48 845/1 Whenever possible..we recorded length and width of the longest leaf lobe and number of leaf lobes for one-leafed plants.