From Daniel Oliver 23 April 1862
Wednesday | 23. Apr. 1862
Here are the flowers of Oxalis as requested. I do not perceive anything distinctly dimorphic.—1
My examining of the plant had reference chiefly to the aestival small flowers: they are very remarkable.— I altered a little the “definition” of the two groups of dimorphism in the paper which you so kindly looked over (& tho’t worth printing!).—2 Making one group with the Dimorphism manifest in, primarily, a separation more or less of the sexual organs, accompanied or not by alteration in the outer whorls.— (Thus including all wholly or partially diclinous plants,—Catasetum, Primula, &c) & the other group marked primarily by alteration primarily in envelopes of the flower without separation of the sexes.
Of course this is only the morphologl. definition
After discussing their function &c. we may class them in corresponding group by other characters.
Very sincerely yours | Danl. Oliver
Distinguishes two kinds of floral dimorphism: that affecting sexual organs and that affecting outer envelopes.
Please cite as
Darwin Correspondence Project, “Letter no. 3515,” accessed on 29 September 2016, http://www.darwinproject.ac.uk/DCP-LETT-3515