I am told that Le Coq⟨,⟩ who has published a voluminous work on the Geograph. Distrib. of Europæan plants mentions not a few instances of apparent dimorphism.2
Lecoq 1854–8. CD had just finished ‘looking through’ this nine-volume work, and had derived from it a number of cases of apparent dimorphism (see letter to Asa Gray, 22 January [1862]); he had cited some of them in his letter to Babington of 20 January [1862]. There is an annotated copy of the work in the Darwin Library–CUL (see Marginalia 1: 488–95).