Thinks Rhamnus is a case of a dimorphic plant that has become dioecious.
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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.
Thinks Rhamnus is a case of a dimorphic plant that has become dioecious.
"It [Rhamnus catharticus?] is certainly a case of dimorphic become dioecious."
Thanks GM for a specimen; it is a sport with which he is already familiar.
Polymorphism in Rhamnus.
Polymorphic flowers of Rhamnus [see Forms of flowers, p. 294].
Reports on his health.
Discusses a surveying expedition under Richard Charles Mayne on which his son will be Second Lieutenant; hopes to arrange for them to excavate some bones in the Falklands.
Sends flowers of the differing kinds [of Rhamnus?] with observations.
Has heard from B. J. Sulivan about the fossils at Gallegos, Patagonia. Would be a great haul for palaeontology if Duke of Somerset would encourage Capt. Mayne to collect them [on survey of Magellan Strait].
Tells JDH of a new map of world that he might use in his lecture [on "Insular floras", BAAS, 1866, J. Bot. Br. & Foreign 5 (1867): 23–31; Gard. Chron. (1867): 6, 27, 50, 75].
Impressed by H. Spencer’s last number, but each suggestion would require years of work to be of use to science.
Cuttings have arrived. Different flower forms [in Rhamnus?].
He has had a great struggle with Buckthorn, and would like CD to see the measurements some time.