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Species and Groups Ploidy List

By David Neumeyer
Reproduced from the ARS

A selected list of rose species and their hybrids according to chromosome number. Ploidy numbers are taken from Modern Roses 8.

Diploids (14 chromosomes):
*Also see entries under "complex species" below

    Max Graf (also Lady Duncan)
    Polyanthas (a few were triploid, but the majority are diploid)
    R. arvensis (including the form "Ayrshire Rose")
    R. banksiae
    R. blanda
    R. bracteata
    R. chinensis (the form of the China Rose)
    R. filipes (and the closely related R. brunonii)
    R. foliolosa
    R. hugonis (Father Hugo rose)
    R. laevigata (Cherokee Rose)
    R. moschata (Musk Rose)
    R. multiflora (this includes the Seven Sisters Rose, multiflora nana, cathayensis, and several others; early hybrids were mostly 14 or 21)
    R. nitida
    R. palustris
    R. roxburghii (Chestnut Rose)
    R. rugosa (forms; hybrids are 14 or 21)
    R. setigera
    R. wichuraiana (form; many of the Wichuraiana climbers or ramblers are 21)
    R. woodsii
    R. xanthina
    Synstylae (members of a large group of Asian species: includes R. multiflora, R. filipes, and many others)

Triploids (21 chromosomes):

    Hybrid Musks (some of the earliest are triploid, having come from Hybrid Perpetuals or Hybrids crossed with the R. multiflora hybrid Trier; many of the subsequent ones are tetraploid)
    R. x borbonia (the original Bourbon rose; most hybrids are tetraploid)

Tetraploids (28 chromosomes):

    Floribundas (a few early ones were triploid, but most are tetraploid)
    Hybrid Teas (a few early ones were triploid, but most are tetraploid)
    R. arkansana
    R. carolina
    R. centifolia (also its sport, the original Moss Rose)
    R. damascena (the type of the Damask Rose; also Autumn Damask, Trigintipetala, and York and
    R. davidii
    R. foetida (including Austrian Copper, Harrison's Yellow, and Persian Yellow)
    R. gallica (type of the Gallica roses; includes Gallica Officinalis and others)
    R. kordesii
    R. laxa
    R. pomifera (Apple Rose; also the form Wolley Dod's Rose)
    R. rubrifolia (R. glauca)
    R. spinosissima (the type of the Scotch Rose; also its forms altaica, hispida, etc.)
    R. suffulta
    R. virginiana

Pentaploids (35 chromosomes):
*See R. canina under "complex species"

Hexaploids (42 chromosomes):

    R. alba (type of the Alba roses)
    R. nutkana

Complex species (forms have different ploidy numbers):

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

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