2. _L. Scariola_ L., a plant very nearly allied to the preceding
and perhaps a variety of it, but having the foliage less abundant,
more glaucous, leaves more sharply lobed, much more erect and almost
parallel with the stem. It has the same geographical range as _L.
virosa_.
3. _L. altissima_ Bieb., a native of the Caucasus, now cultivated in
Auvergne in France for yielding lactucarium. It is a gigantic herb,
having when cultivated a height of 9 feet and a stem 1½ inches in
diameter. Prof. G. Planchon believes it to be a mere variety of _L.
Scariola_ L.