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From Asa Gray   4 August 1862

Summary

Gives J. T. Rothrock’s observations on the structure and fertility of the two forms of Houstonia. Mentions his own observations on Rhexia virginica and Gymnadenia tridentata.

Author:  Asa Gray
Addressee:  Charles Robert Darwin
Date:  4 Aug 1862
Classmark:  DAR 110 (ser. 2): 67–9
Letter no:  DCP-LETT-3679

From Asa Gray   18–19 August 1862

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Summary

Notes and observations on orchids.

Author:  Asa Gray
Addressee:  Charles Robert Darwin
Date:  18–19 Aug 1862
Classmark:  DAR 165: 111, 116
Letter no:  DCP-LETT-3688