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To Asa Gray   20 March [1863]


Discusses the meaning of C. K. Sprengel’s term "dichogamy". Dichogamous plants are functionally monoecious; Primula is functionally dioecious.

Reports Hermann Crüger’s observations of Cattleya and of bees pollinating Catasetum. Crüger will observe Melastomataceae.

Has built a hothouse.

Fears Amsinckia cannot be dimorphic.

Ill health slows his work on Variation.

Author:  Charles Robert Darwin
Addressee:  Asa Gray
Date:  20 Mar [1863]
Classmark:  Gray Herbarium of Harvard University (58)
Letter no:  DCP-LETT-4053