Paeonia Pallenis 
Pallenis maritima
(= Asteriscus maritimus)
Pallenis spinosa
(= Asteriscus spinosus)
Pancratium Papaver Parentucellia Parnassia Paronychia Pastinaca Pedicularis Penstemon 
Penstemon newberryi
Perezia Persicaria Petasites Petrocallis Petrocoptis Petromarula Phedimus 
Phedimus sichotensis
(= Sedum sichotensis)
Phedimus spurius 'Tricolor'
(= Sedum spurium 'Tricolor')
Phalaris Phegopteris Phlomis 
Phlox
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