Search: Charles Darwin in collection 
Darwin, C. R. in correspondent 
Gray, Asa in correspondent 
1850-1859::1856 in date 
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From:
Charles Robert Darwin
To:
Asa Gray
Date:
2 May [1856]
Source of text:
Archives of the Gray Herbarium, Harvard University (4)
Summary:

Suggests affinities of the U. S. flora that he considers would be worth investigating. Wants to know the ranges of species in large and small genera.

Questions AG on naturalised plants; whether any are social in U. S. which are not so elsewhere and how variable they are compared with indigenous species. Would like to know of any differences in the variability of species at different points of their ranges and also the physical states of plants at the extremes of their ranges.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Asa Gray
Date:
14 July [1856]
Source of text:
Archives of the New York Botanical Garden (Charles Finney Cox Collection)
Summary:

Asks whether Allegheny Mountains are sufficiently continuous so that plants could travel from north to south along them.

Hopes AG’s work on geographical distribution is progressing, as he has questions on plants common to Europe which do not range up to Arctic.

Are intermediate varieties less numerous in individuals than the varieties they connect?

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Asa Gray
Date:
24 Aug [1856]
Source of text:
Archives of the Gray Herbarium, Harvard University (36)
Summary:

Rarity of intermediate varieties.

Variability of introduced plants.

Ranges of plants common to Europe and U. S.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Asa Gray
Date:
12 Oct [1856]
Source of text:
Archives of the Gray Herbarium, Harvard University (6)
Summary:

Thanks AG for the first part of his "Statistics [of the flora of the northern U. S.", Am. J. Sci. 2d ser. 22 (1856): 204–32; 2d ser. 23 (1857): 62–84, 369–403]

and for information on social and varying plants.

Would like to know number of genera of introduced plants in U. S.

Is surprised at some affinities of northern U. S. flora and asks for any climatic explanations.

Asks what proportion of genera common to U. S. and Europe are mundane.

Is glad AG will work out the northern ranges of the European species and the ranges of species with regard to size of genera.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Asa Gray
Date:
24 Nov [1856]
Source of text:
Archives of the Gray Herbarium, Harvard University (5)
Summary:

Variability of naturalised plants.

Distribution of Arctic/alpine plant species.

Limits to the northern range of plants.

Contributor:
Darwin Correspondence Project
From:
Asa Gray
To:
Charles Robert Darwin
Date:
[early Aug 1856]
Source of text:
DAR 165: 93
Summary:

Believes intermediate varieties are generally less numerous in individuals than the two states that they connect.

Discusses the difficulties of deciding what is the typical form of a species

and gives some opinions on the variability of introduced species compared with indigenous species.

Contributor:
Darwin Correspondence Project
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From:
Asa Gray
To:
Charles Robert Darwin
Date:
23 Sept 1856
Source of text:
DAR 165: 94
Summary:

Plants that are social in the U. S. but are not so in the Old World.

Distribution of U. S. species common to Europe.

Gives Theodor Engelmann’s opinion on the relative variability of indigenous and introduced plants and notes the effects of man’s settlement on the numbers and distribution of indigenous plants.

Contributor:
Darwin Correspondence Project
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From:
Asa Gray
To:
Charles Robert Darwin
Date:
4 Nov 1856
Source of text:
DAR 165: 95
Summary:

Outlines the ranges of northern U. S. species common to Europe. Hopes to investigate the resemblances between the floras of the north-eastern U. S. and western Europe. Discusses routes by which alpine plants appear to have reached U. S.

Contributor:
Darwin Correspondence Project
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