The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
260. A few verbs of the Second Conjugation
(generally intransitive) are recognizable as formed from noun-stems; but
most are inherited, or the primitive noun-stem is lost: -
-ére, to be white, from albus (stem albo/e-), white.
- cáneo, -ére,
to be hoary, from cánus
(stem cáno/e-), hoary.
-ére, to shine, from clárus, bright.
- claudeó, -ére,
to be lame, from claudus,
- algeó, -ére,
to be cold, cf. algidus,