Tropicals & Tender Perennials: Debate: When is a double a double?, 1 by xeriscape8321

xeriscape8321 wrote:
I have been wrestling with this question for years and it has been really nagging me lately because of this new seedling that I have. With this seedling (Rosamond x Dbl Peach) all of most of my blossoms have some corolla material stuffed up inside the corolla (the corolla is 13' long so that way up there for most). I have yet to see a bloom without some piece of something (although it may be raggedy) lurking up inside the bloom. Then the other day a fully formed double bloomed out.
My question is when do you call a plant a Double"? I have grown plants like Double Delight that after 3 years of growing and lots and lots of blooms, not only did I never see a double, I never saw any material up inside it either. The seedling I have is showing genetic double traits on every bloom, but many of the blossoms appear single to the naked eye.
Where is the fine classification line to describe a cultivar as a double. I would appreciate as much feedback on this as possible since I can find no other threads that address this topic.

Here you have some pretty blooms that appear singles (if you look in the upper top on the left you can see a full double on the same plant)