To Asa Gray 12 October [1856]
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.
| Author: | Charles Robert Darwin |
| Addressee: | Asa Gray |
| Date: | 12 Oct [1856] |
| Classmark: | Archives of the Gray Herbarium, Harvard University (6) |
| Letter no: | DCP-LETT-1973 |
| letter | (1) |
| Darwin, C. R. | (1) |
| Gray, Asa | (1) |
| Darwin, C. R. | (1) |
| Gray, Asa | (1) |
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