Comments on species with disjoined ranges; does not feel, despite CD's expectations, that they tend to belong to small families.
Gives the proportion of U. S. trees in which the sexes are separate [see Natural selection, p. 62].
Cambridge, Mass. U.S.A.
June 1st, 1857
My Dear Darwin
Yours of the 9th
I do not wonder you were somewhat puzzled to make out just the 49 species
spoken of in my note p. 387. It was a clear mistake
my speaking of 6 species of Carex as belonging to 1st &
2d heads—as evidently there are only three of the
1st head and none of the 2d
I mail you a fresh copy of the article, with the 49 species I must have had in view marked with a — in pencil.—
The 49 or rather 50, species belong to 46 genera,—which is as you would have it.—
I did not know at all that you suspected disjoined species to belong to small genera & small orders, as a general thing.
The monotypic genera of these 50 species are—
The only good-sized genera are Anemone, Silene (S. Antirrhina is diffused as a weed & by the agency of man?) Cerastium, Potentilla, Plantago, Primula, Veronica, Carex, Poa, Festuca, Adiantum.
My 76 disjoined species belong to 34 families,—and I cannot
see that they incline to belong to small families.
18 ’ Cyperaceæ ’
The 1 Leguminosa & 1 Composita are as you would like; but that is because these orders are remarkable for their species being of narrow range.
3 are Rosaceæ
2 ’ Scrophulariaceæ (the 1 orchid is to be erased)
3 ’ Ranunculaceæ. &c &c
6 ’ Umbelliferæ
As to our trees, what proportion have flowers more or less
separated. Number the orders on p. 400— 1. Magnoliaceæ, and
so on. And append
separated flowers 1. Magnoliaceæ 0 2 — 0 3 — 0 4
— 0 5 — 1 p 6 — 8 p. 7
— 2 d 8 — 0 9 — 1 m 10 —
1 p 11 — 2 p. d. 12 0 13 0 14 1-p 15 1 p 16 0 17
— 7 p. d. 18 — 2 p 19 — 8 p. d.
20 — 1 m 21 — 9 m 22 — 21 m. 23
— 5 m. 24 7 d 25 Coniferæ—
18 m. d.
Out of 132 trees, those with separated flowers more or less—are 95.—and for the greater part very decidedly separated.
I must think it by chance—that your
introduced plants are in so near the proportion by families that the indigenous species
’ Orchidaceæ – 0
I am very glad if my published notes or my jottings are of any use to you.
This is my season of greatest and most distracting occupation. I shall have no article in the July no. of Sill. Journal—nor in the Sept. either, I fear.
I wrote—or rather despatched a letter to you last week—— Watson's memoranda will be sent back to you a week or two hence—
Ever Yours | A. Gray
- f1 2098.f1See letter to Asa Gray, 9 May .
- f2 2098.f2See letters to Asa Gray, 1 January  and [after 15 March 1857]. Gray refers to his tabulation of the trees of the northern United States in A. Gray 1856–7, p. 400.
- f3 2098.f3See letter to Asa Gray, 9 May .
- f4 2098.f4See letter from Asa Gray, [c. 24 May 1857].
- f5 2098.f5See letter to Asa Gray, [after 15 March 1857], in which CD enclosed some notes and a letter from Hewett Cottrell Watson.
- f6 2098.f6A. Gray 1856–7. See n. 2, above.