I was wondering about this rubiginosa hybrid, rosa magnifica. HelpmeFind says it is pentaploid but there is no reference for that. Could it be that this rose is actually hexaploid? 'Magnifica' Rose
Look in the references. This is there.
Chromosomes of Garden Roses
Article (misc) (1954) Page(s) 51.
Rosa rubiginosa magnifica 35 chromosomes.
Clicking on the title on the Reference page provides this…
Article (misc) published 1954 by American Rose Annual.
Authored by Ann P. Wylie
EDIT
… synopsis
8 favorite votes.
EDIT
Most of the list is available on the website, Old Garden Roses and Beyond, by Paul Barden.
This article originally appeared on pp. 36-66 in the 1954 American Rose Annual, listing the chromosome counts of 234 garden roses.
Thank you Kim,
but still… I doubt it is pentaploid, when you look at it’s parentage, it would make more sense to be hexaploid.
This one states (HMF): “‘Lucy Ashton’ self seedling”.
Yes, Lucy Ashton is stated as hexaploid, but by the time there are so many chromosomes I would not be surprised to see a number of different chromosome numbers in the pollen.
Also, some times/ often / most of the times? parentages of old roses are to be taken with a grain of salt.
Also, maybe the bees had something to say about that.