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From:
Hewett Cottrell Watson
To:
Charles Robert Darwin
Date:
2 Oct 1855
Source of text:
DAR 181: 30
Summary:

Expresses his general opinion on the relative closeness of species in large and small genera. Warns that the size of a genus is dependent upon the locality and extent of the flora studied, that definitions of close species are not consistent, and that peculiarities of botanical classification will influence any attempt to assess the comparative closeness of species in different genera.

Contributor:
Darwin Correspondence Project