Difficulty of distinguishing varieties and species. Did HCW suggest a printed list that might help?
Polymorphic genera.
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The Charles Darwin Collection
The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
Difficulty of distinguishing varieties and species. Did HCW suggest a printed list that might help?
Polymorphic genera.
On geographical distribution of plants. Plant systematics and natural classification.
Do the plants that are common to Europe and North America nearly all live north of the Arctic Circle? CD bases his question on HCW’s "capital" comparison between relations of Europe to North America and Europe to E. Asia if the intervening land had been submerged. CD has been led to speculate that in the mid-Pliocene the organisms now living in middle Europe and northern U. S. lived within the Arctic Circle. Subsequent movements of this flora with advance and retreat of glaciers would explain present distribution better than Forbes’s vast submergences.
Discusses the possibility of "convergence" occurring; believes it could be only very limited.
Asks HCW’s help with his experiments on Lythrum salicaria, for which he needs flowers of the rare Lythrum hyssopifolia.
Thanks HCW for Lythrum specimens.
CD has at last finished his Lythrum paper. ["Three forms of Lythrum", Collected papers 2: 106–31.]