It is a little difficult to tell the xpowellis and crosses with xpowellii from each other. As with many (most?) plants, the quality of the flower is quite variable depending on culture. I have Cecil and the common Dutch run of pink powelli, and at times they aren't terribly different, going by the flower alone.
Cecil's blooms are larger when well-grown, but in less than optimum conditions, the blooms, especially the last in the scape, are only as large as in a well-grown common pink. Color is paler on both in lower light, but longer-lasting. Cecil's tepals are usually fuller, that is wider, but may not fully show this under poor conditions. The central white area extends further out from the center, too. It also has a stronger fragrance.
Cecil blooms more frequently. Mine is on its fourth scape which have come one after the other, sometimes over-lapping, but the last scape after a week or so pause after the one before it.
Another difference is that the plant is sronger, stouter-growing as compared to one of equal age/culture of the common pink. Scapes are thicker too and taller. Cecil is a tetraploid, and will set seed more readily than xpowellii, which I have never gotten a seed from despite using several different pollens.
JC Harvey offsets heavily and has thinner foliage that frequently shows a couple of channels near the edges of the leaf. It blooms much less often than the common pink, which also has more substance in the leaf and lacks the extra channels down the leaf length as in JCH.
If you grow the common pink, JC Harvey and the Cecil together, you can observe the differences more readily.
But don't discount JC Harvey or another hybrid just yet. The bloom you show looks more like JCH than Cecil to my eye. Do you have any pix of the foliage? That might help some.
R.
