From Asa Gray 15 July 1
July 15. Evening.
On my way into Boston to mail the present envoi,2 I received yours of July 1..3 I open my envelope to acknowledge it.—
First, I am very sorry to hear that your health has suffered.4
2. Platanthera orbiculata has discs still wider apart than P. Hookeri, but no division into “2 bridal chambers”5
I am curious to know what you will say of my notes on P. hyperborea.6 I hope to be able to repeat the observations—in the field. Your son’s obs. on minute insects fertilising is to be noted.7 My pupil, Rothrock, catches Thrips, and only Thrips—in Houstonia.8
About “a third form in some genus—both stamens & pistil short”—9 I think you have a Mertensia in mind which you have referred to in your dimorphic paper;10 but it was noticed only on one or 2 specimens,—of a rare plant—and I do not think much of it. You want facts which can be verified and re-examined. I doubt you have made quite enough of it already,—unless it jibes in with some other better-observed facts.
See end of my over sheet.11
Mitchella repens, L
Two sorts of flowers,
I have had no time to look at them, fresh or dry.13
If young enough the differences would doubtless be as evident (between the pollen & stigmas of the two) as in Houstonia, of which I have sent, or will send, details.14
I have failed to get Rhexia,15
Observations on Platanthera.
Possibility of trimorphism in Mertensia.
Please cite as
Darwin Correspondence Project, “Letter no. 3659,” accessed on 21 October 2016, http://www.darwinproject.ac.uk/DCP-LETT-3659