I did not notice them on one tree. Do they have synonyms ? P. strictus is mentioned somewhere.
If they are on the same branch and have the same chromosome number (fourth column), then it is likely you have a hybrid. The third column has an X for bird pollination. Click on one of the trees until you get it readable. http://www.amjbot.org/cgi/content/full/93/11/1699 -- Larry Wallace Cincinnati
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