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Polystichum munitum

Common sword fern

Polytaenia nuttallii

Prairie-parsley

Polystichum californicum

Polytrichum commune var. commune

Polytrichum formosum

Polytrichum attenuatum

Polytrichum longisetum

Polytrichum gracile

Polytrichum ohioense

Ponthieva racemosa

Populus × canadensis

Populus × eugenei

Populus × robusta

Populus × petrowskiana

Populus × sennii

Populus balsamifera var. californica

Populus wislizeni

Populus fremontii var. macdougalii

Populus × polygonifolia

Porella japonica subsp. appalachiana