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Persicaria amphibia
Persicaria amphibia
Persicaria amphibia
Persicaria amphibia
Persicaria hydropiper
Persicaria lapathifolia
Persicaria pensylvanica
Persicaria sagittata
Persicaria virginiana
Persicaria virginiana
Petasites frigidus
Phegopteris connectilis
Phemeranthus parviflorus
Phlox divaricata
Phlox divaricata
Phlox maculata
Photographs, 1940-2005 (Box 2, Folder 32)
Phragmites australis
Phryma leptostachya
Physalis heterophylla