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Pogonia
Pogonia
Poison Sumac berries in autumn
Polemonium reptans
Polemonium reptans
Polgonatum sp. (Liliaceae)
Policemen's main drill at the North China meet, October 10, 1934. Nankai University cheering team in white in the bleachers.
Polinsky and Co. Meats, Duluth, Minnesota
Polish choir
Political Map of China Showing Christian Mission Stations
Political march
Polkas in Six Numbers
Pollen of epilobium, etc.
Pollination in Asclepias
Pollination in Cypripedium, etc.
Pollination in Epilobium
Pollination in Epilobium, chart, diagram
Pollination in Monkey Flower
Pollination in raspberry, etc.
Pollinia (Chrysopogon), Orchis mascula
Pollution
Pollution
Pollution. Mahoning River.
Pollution. Mahoning River.
Pollution, Mahoning River downstream from Youngstown, Ohio
Polygala cruciata, L.
Polygala senega
Polygonaceae
Polygonatum biflorum
Polygonatum commutatum (Polygonatum biflorum)
Polygonatum commutatum (Polygonatum biflorum)
Polygonatum sp. (Liliaceae)
Polygonatum sp. (Liliaceae)
Polygonatum sp. (Liliaceae)
Polygonatum sp. (Liliaceae)
Polygonatum sp. (Liliaceae)
Polygonatum sp. (Liliaceae)
Polygonum amphibium and Utricularia vulgaris
Polygonum persicaria
Polygonum persicaria
Polypodium on a great tree trunk
Polypodium vulagare on rock cliff
Polypodium vulgare nestling among rocks
Polypodium vulgare on top of rock ledge
Polystictus pergamenus (Trichaptum biforme)
Polystictus pergamenus (Trichaptum biforme)
Polystictus versicolor (Trametes versicolor)
Polytrichum bed, male and female with sporophytes
Polytrichum commune
Polytrichum gracile Menz.