[94]

∗ p 39 of addenda Gaertner Bastarderzeugung says S.574, that some have thought that monotypic species do not vary. He does not give any authority, except Puvis (De la Dégénération p. 37) who refers only to varieties raised under culture, & adduces to supposed fact in regard to all variation being due to intercrossing.

Has this been worked in

[Natural selection, p. 162: "If we now look to the genera with a single species (right hand column in Tab. I) the difficulty in identifying the species is reduced to a minimum, yet we find that the number of species in these monotypic genera1 which have varieties, though proportionally less than in the next group of larger genera, is by no means diminished in an extreme degree, as might have been confidently expected on Dr. Hooker's view: in two instances, namely in the U. States & Dalmatia, the number is actually greater than in the next group of larger genera.
1 [ ] says p. 574 that some have thought that monotypic species do not vary. He does not give any authority except [Puvis] (De la Dégéneration p. 37) who refers only to varieties raised under [cultivation], and adduces the supposed fact in regard to all variations being due to intercrossing."]