Stella's kind of weird, too. It's registered to have 11" scapes. And I see them that size in parking lot islands and between roads for decoration. But my Stella are really big, old clumps. Probably around 30 years old, because I know who built the garden at my house, and when they did it. My records say I get 20-24 " scapes, and I can get anything from 8 to 13 buds on a scape. But I think the 2.75 " flower is pretty standard.
If your flower is a little less than 3 inches across, I'd guess Stella. If it's less than 2, Jablonski also registered "Mini Stella", which is supposed to have a 1.25" bloom an be a few inches shorter.
Tim
