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From Asa Gray   [10–16] June [1863]

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Summary

Possible dimorphism in Phlox.

Knows of no U. S. law prohibiting marriage of cousins.

Gives references to papers on phyllotaxy.

Author:  Asa Gray
Addressee:  Charles Robert Darwin
Date:  [10–16] June [1863]
Classmark:  DAR 165: 136
Letter no:  DCP-LETT-4198

To Asa Gray   26 June [1863]

Summary

Thanks AG for references about phyllotaxy

and information on marriage laws.

Has been looking for dimorphism in Phlox and Euonymus.

Has observed the irritability of tendrils of Echinocystis with great interest. Was also struck by the rotating movements of the leading shoots, which he proposes to investigate.

Author:  Charles Robert Darwin
Addressee:  Asa Gray
Date:  26 June [1863]
Classmark:  Gray Herbarium of Harvard University (82)
Letter no:  DCP-LETT-4222