April 28/80
My dear Mueller
There is variability in the color of various Cruciferae2 but I do not remember any of that from yellow to white, except Raphanus Raphanistrum & the [Austn] Drabas as to which whether from hybridization or variation I cannot tell but in the Herbm it seems impossible always to define the golden from the white [fld.] except by color of flower.
Of course you know how variable Cheiranthi are
As to your Polypodium Mr Baker has carefully examined it again & regards it as a mere state of Nephrod. decompositum wanting the involucre & he regards Pol. rufescens Blume as an analogous form of the less divided variety of the same species3
Ever most sincy yr
J D Hooker
Cheiranthus
Cruciferae
Draba
Nephrodium decompositum
Polypodium rufescens
Raphanus Raphanistrum
Please cite as “FVM-80-04-28,” in Correspondence of Ferdinand von Mueller, edited by R.W. Home, Thomas A. Darragh, A.M. Lucas, Sara Maroske, D.M. Sinkora†, J.H. Voigt† and Monika Wells accessed on 25 April 2024, https://epsilon.ac.uk/view/vonmueller/letters/80-04-28