There is some interesting news for 'Hermosa'. It seems that a recent genetic study has identified more than one individual is going around under this name, even though to our eyes essentially similar enough to seem identical. This reminded me of something I read in "The Graham Stuart Thomas Rose Book" from 1994. In the back, he included some writings of Dr. C. C. Hurst. On page 313, Dr. Hurst begins a discussion about the Bourbons. On the following page (314) was this bit:

"...Although from the first the Bourbon was a distinct type of Rose with its stout prickly stems, vivid rose-colored flowers with rounded imbricated petals and broad leathery leaves, various breaks occurred from time to time through segregation as well as through hybridization. Between 1834 and 1841 the China reversion 'Hermosa' appeared independently with four different breeders, and it is unlikely that all these were due to a China back-cross...."

Essentially, he posited that as Bourbons self-seeded, China characteristics sometimes emerged predominantly, resulting in a sort of "throwback" to 'Old Blush'. The result would be a very China-like rose, perhaps a bit more robust with its dash of Bourbon. This is also likely what "Sophie's Perpetual" is -- a China-reversion from Bourbon breeding. But in any case, this could explain why named plants of 'Hermosa' today are not all genetically identical.

:-)

~Christopher