Tiffany - Thanks for the links! I believe my 3 Ponytail Palms are Beaucarnea recurvata because the leaves are solid green. B. guatemalensis seems to have reddish leaves as they emerge from the trunk.
I have a feeling they have a pretty massive root system as the little ones I have surprised me. One of the pots broke and I pulled the plant out and could see all the roots. Impressive for a succulent.
I am reading that they could get quite large. 6' diameter caudex and as high as 50'. Yikes! Much bigger than I was thinking. Maybe I need to keep mine in pots?