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DCP-LETT-3634

From:
Charles Robert Darwin
To:
Asa Gray
Date:
1 July [1862]
Source of text:
Gray Herbarium of Harvard University (69)
Summary:

Thanks for notes on Cypripedium and Platanthera hookeri, which is really beautiful and quite a new case.

His son, George, has been observing the insect fertilisation of orchids.

CD has been crossing peloric flowers of Pelargonium, but doubts he will get good results with respect to sterility of hybrids.

Rhexia glandulosa does not appear to be dimorphic. Lythrum is trimorphic.

Contributor:
Darwin Correspondence Project

DCP-LETT-3656

From:
Charles Robert Darwin
To:
Asa Gray
Date:
14 July [1862]
Source of text:
Gray Herbarium of Harvard University (70)
Summary:

Adaptations of orchid flowers. Believes the structure of all irregular flowers is adaptation to insect fertilisation.

Linum grandiflorum distinguishes its own pollen so that when placed on stigma of same flower the pollen-tube is not even exserted.

Contributor:
Darwin Correspondence Project

DCP-LETT-3662

From:
Charles Robert Darwin
To:
Asa Gray
Date:
23[–4] July [1862]
Source of text:
Gray Herbarium of Harvard University (76)
Summary:

AG’s orchid observations are admirable.

Owen has lectured on birds’ descending from one form.

French criticism of CD’s Primula paper.

Only AG has seen that Orchids was "a ""flank movement"" on the enemy".

Contributor:
Darwin Correspondence Project

DCP-LETT-3667

From:
Charles Robert Darwin
To:
Asa Gray
Date:
28 July [1862]
Source of text:
Gray Herbarium of Harvard University (75)
Summary:

AG’s "capital" review of Orchids [Am. J. Sci. 2d ser. 34 (1862): 138–44].

Thinks there are three forms of Lythrum salicaria.

Discusses transport of seeds by sea.

Contributor:
Darwin Correspondence Project
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