Chromosome count

? Unbalanced

= Balanced

Diploides

Rosa arvensis = ? ?

Rosa ayrshire = ? ?

Rosa banksiae = ? ?

Rosa blanda = ? ?

Rosa bracteata = ? ?

Rosa chinensis = ? ?

Rosa cinnamomea = ? ?

Rosa filipes = ? ?

Rosa brunonii) = ? ?

Rosa foliolosa = ? ?

Rosa hugonis = ? ?

Rosa laevigata = ? ?

Rosa moschata = ? ?

Rosa multiflora = ? ?

Rosa nitida = ? ?

Rosa palustris = ? ?

Rosa polyanthas = ? ?

Rosa roxburghii = ? ?

Rosa rugosa = ? ?

Rosa setigera = ? ?

Rosa Synstylae = ? ?

Rosa wichuraiana = ? ?

Rosa woodsii = ? ?

Rosa xanthina = ? ?

Max Graf = ? ?

Triploids

Hybrid Musks ?

Tetraploid

Floribundas = ?? ??

Hybrid Teas = ?? ??

Rosa arkansana = ?? ??

Rosa carolina = ?? ??

Rosa centifolia = ?? ??

Rosa damascena = ?? ??

Rosa davidii = ?? ??

Rosa dupontii = ?? ??

Rosa foetida = ?? ??

Rosa gallica = ?? ??

Rosa kordesii = ?? ??

Rosa laxa = ?? ??

Rosa pomifera = ?? ??

Rosa glauca ? ??? ?

Rosa spinosissima = ?? ??

Rosa suffulta = ?? ??

Rosa virginiana = ?? ??

Rosa lucida = ?? ??

Pentaploids (35 chromosomes):
Rosa canina ? ??? ??

Hexaploid

Rosa wilsonii ? ?????? ??

Rosa alba ? ?????? ??

Rosa nutkana ? ?????? ??

Complex species (forms have different ploidy numbers):

Rosa acicularis (14, 28, 42, 56)
Rosa californica (14, 28)
Rosa canina (Dog Rose; most are 35, but some forms are 42)
Rosa chinensis (China Rose; most forms are 14, but some forms and species hybrids are 21, 28)
Rosa cinnamomea (14, 28)
Rosa eglanteria (Sweet Briar; 35, 42)
Rosa moyesii (28, 42)
Rosa odorata (Tea Rose; most are 14, but some forms and hybrids are 21, 28)