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Puccinellia lemmonii

Pulsatilla vulgaris

Pycnanthemum torrei

Pycnanthemum tullium

Quercus × venulosa

Pylaisia ontariensis

Pylaisia polyantha var. jamesii

Pyramidula tetragona

Quercus × chasei

Pycnanthemum pycnanthemoides

Southern mountain-mint

Pyracantha angustifolia

Narrowleaf firethorn

Pyracantha coccinea

Firethorn

Pycnanthemum virginianum

Pyrola rotundifolia

Round-leaf wintergreen

Pyrola chlorantha

Green-flower wintergreen

Pyrrhopappus rothrockii

Pyrrocoma carthamoides var. carthamoides

Pyrrocoma insecticruris

Pyrrocoma hirta

Pyrrocoma hirta var. hirta