Hi Greg:
For what it is worth, I learned it years ago that
Citrus maxima is the Pomelo and
Citrus grandis
is the Pummelo. The main difference aside from
flesh color, one being white to slightly pink and
the others can be white, pink and rose pink to
rose red in flesh, is one fruit can be larger in size
than the other, how the segments peel as the old
Shaddock will have its segments separate easier
than trimming off so much of the albedo to get
to the flesh of the Pummelo and the number of
distinctly shaped segments.
Below is a link to a document file that has their
own distinction to some degree between
Citrus
maxima and
Citrus grandis.
Genetics and Breeding - Pummelo
http://www.icuc-iwmi.org/files/Publications/pummelo_genetics.doc
I prefer to see a photo of the fruit cut in half before
committing as to what it might be. If we look at the
photos from the Sunkist chart and specialties pages
we see the flesh color being very similar to a Chandler.
Seasonal Fruits Chart - Oranges & Tangerines - Sunkist
http://www.sunkist.com/products/varietal_chart.asp
Seasonal Fruits - Oranges & Tangerines - Sunkist
http://www.sunkist.com/products/seasonal_specialties.asp
We look on the box to learn the variety as opposed
to the supermarket name it is sold as being. An example
of such is that I recently saw a Topaz Mandarin as the
sales name for the fruit. I looked on the box and it had
Ortanique Mandarin as the variety of the fruit.
Continued success with the in ground and container Citrus.
Jim