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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

To Asa Gray   9 August [1862]

Summary

Believes Lythrum is trimorphic. Asks AG for seeds of plants he suspects are polymorphic.

Author:  Charles Robert Darwin
Addressee:  Asa Gray
Date:  9 Aug [1862]
Classmark:  Gray Herbarium of Harvard University (71)
Letter no:  DCP-LETT-3685

From Asa Gray   18–19 August 1862

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

To Asa Gray   21 August [1862]

Summary

Emma and Leonard have scarlet fever.

Houstonia seems "a grand case"; J. T. Rothrock should publish his observations on the two pollens and the reciprocal action of two hermaphrodites.

Rhexia glandulosa offers nothing odd, but Heterocentron will turn out something marvellous like Lythrum.

Would like to know what AG thinks of last chapter of Orchids.

Author:  Charles Robert Darwin
Addressee:  Asa Gray
Date:  21 Aug [1862]
Classmark:  Gray Herbarium of Harvard University (67)
Letter no:  DCP-LETT-3692
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