Here is a bit of wild theory! (342/1.
See Asa Gray, "Scientific Papers," 1889, Volume II., page 235, on "The Pertinacity and Predominance of Weeds," where the view here given is adopted.

In a letter to Asa Gray (November 6th, 1862), published in the "Life and Letters," II., page 390, Darwin wrote: "Does it not hurt your Yankee pride that we thrash you so confoundedly?
I am sure Mrs.Gray will stick up for your own weeds.

Ask her whether they are not more honest downright good sort of weeds.") But I did not sit down intending to scribble thus; but to beg a favour of you.

I gave Hooker a list of species of Silene, on which Gartner has experimentised in crossing: now I want EXTREMELY to be permitted to say that such and such are believed by Mr.Bentham to be true species, and such and such to be only varieties.

Unfortunately and stupidly, Gartner does not append author's name to the species.
Thank you heartily for what you say about my book; but you will be greatly disappointed; it will be grievously too hypothetical.