To T. H. Farrer 20 October 1
Down. | Beckenham | Kent. S.E.
My dear Farrer
Your notes strike me as good & I agree with Hooker that they are quite worth publication; but I wish you could first have examined more species.—2 Especially Passiflora princeps, a splendid species, (as I believe called) in which, as I remember (for I cannot find my notes wh. I suppose I made) there were some (3?) regular rounded passages or holes through the corona to the nectary. The nectary, if my memory serves me, was constructed like that of Tacsonia.3
My Tac: van volxenis has produced, without any aid in fertilisation, plenty of fruit with an abundance of apparently good seed: the fert: is effected by each of the three stigmas slowly curving upwards (flowers being pendent) & in thus moving they generally touch one of the anthers of same flower.—4
See Hildebrand in pamphlet last sent, on abortion of stamens in uppermost or final dichogamous flower in Geranium:5 this seems an eminently interesting case of abortion— attend to other such cases— see how is the last flower in reference to its capacity for being fertilised.—
Yours very sincerely | C. Darwin—
You ought to set up in cool Hothouse & Greenhouse.— Could you not go to Kew & see if any Passifloras are now in flower?6
Comments on notes made by THF on Passiflora and Tacsonia. Suggests he examine more species. Recalls his own observations on P. princeps and Tacsonia.
Please cite as
Darwin Correspondence Project, “Letter no. 6945,” accessed on 28 October 2016, http://www.darwinproject.ac.uk/DCP-LETT-6945