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From Asa Gray 16 February 1857
Summary
Discusses the ranges of alpine species in U. S. and considers the possible migration routes of such species from Europe.
Lists those U. S. genera which he considers protean and describes the U. S. character of some genera which are protean in Europe.
Describes how he distinguishes introduced and aboriginal stocks of the same species.
| Author: | Asa Gray |
| Addressee: | Charles Robert Darwin |
| Date: | 16 Feb 1857 |
| Classmark: | DAR 165: 96 |
| Letter no: | DCP-LETT-2053 |
Addressee
| Darwin, C. R. | (1) |
Correspondent
| Darwin, C. R. | (1) |
| Gray, Asa | (1) |
