Do you have a list of native plants of Philadelphia?
For an extensive list, see the Fairmount Park Restoration page on the Academy of Natural Sciences website:
On this page, you will find links to the park master plan for environmental restoration. You should look in particular at Volume III, Appendices. In this volume, look at Appendix A-1, Flora. You will see the plant lists and each plant is designated as ‘I’ = Introduced; ‘N’ = native to Philadelphia; ‘A’ = native to US, not Philadelphia…etc. This appendix is several pages long.
Here are more links, with smaller numbers of native plants listed in them:
See the plant list for Concourse Lake, Fairmount Park, Philadelphia:
See the plants listed in the Wissahickon Restoration Volunteers page here:
Hope this helps.