To Asa Gray 17 February 
Down, | Beckenham, Kent. | Railway Station | Orpington. S.E.R.
My dear Gray
I thank you much for your pleasant letter of Feb. 3d. Hooker has been here 2 or 3 times (as Lady H. has been here for a fortnight as a sanatarium) & I told him about Linum perenne & he was interested & looked to his Colorado specimens. He finds “the American form is less strongly heterostyled than the European, & that the stamens & styles are even equal in some specimens”; but he also finds variability in length in the European specimens.—
If I was forced to wager I wd. bet that the American form would prove at least functionally a distinct species.— If you could get & send me seed of the Colorado form, I wd grow both forms & see if they could be intercrossed artificially, & I would try whether the homostyled individuals were self-fertile.—
Yours affectionately | Ch. Darwin
Heterostyly in Linum perenne. Believes the American form may be a distinct species.
Please cite as
Darwin Correspondence Project, “Letter no. 11364,” accessed on 6 May 2016, http://www.darwinproject.ac.uk/DCP-LETT-11364