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1995 - 200 of 210479 results
Populus deltoides
Populus deltoides fruits and seeds
Populus deltoides, leaf of, venation
Populus forest along Highway Number 1 near Grand Marais and the border
Populus Gall causing friction against rock
Populus leaf, venation
Populus leaves
Populus leaves
Populus nigra in early spring
Populus nigra in early spring
Populus nigra leaf
Populus nigra leaf
Populus nigra Tree in early spring
Populus nigra Tree in early spring
Populus tremuloides
Populus tremuloides
Populus tremuloides, close up
Populus tremuloides fruits and seeds
Populus tremuloides leaf
Populus tremuloides leaf
Populus, trunk and bark
Porcupine on the Isabella River
Porella on black ash
Porphyra naiadum (Smithora naiadum) on eel-grass
Portulaca oleracea
Position of bud and flower in Laburnum
Postelsia, distant view
Postelsia, distant view of plants
Postelsia, near view, barnacles and mussels on the rocks
Postelsia, near view of six plants
Postelsia, new view
Potentilla
Potentilla fruticosa
Potentilla fruticosa flower
Potentilla succession on the rocks on the North Shore
Potentilla tridentata
Potentilla tridentata
Potentilla tridentata on the rocks
Pot holes in the rocks at Taylor's Falls
Prairie Rattlesnake near Keota
Preissia
Preissia, near view
Prenanthes alba
Preparing a decoy for bear at the Bald Eagle Camp
Prickly pear cactus and yucca
Prickly pear cactus in the grasslands of Montana
Primula mistassinica
Primula on a cliff along the St. Croix river
Primula on a cliff along the St. Croix river
Primula on cliff above Stillwater on the St. Croix river
Primula on cliff above Stillwater on the St. Croix river, near view
Proserpinaceae leaves
Proserpinaceae leaves in water
Proserpinaceae leaves with the water level raised
Protection of pollen from rain
Prunus americana leaf
Prunus americana leaf
Prunus pensylvanica leaf
Prunus pumila
Prunus pumila, close up of flowers
Prunus pumila with bur oak in background
Prunus serotina leaf
Prunus virginiana
Prunus virginiana, close-up
Prunus virginiana leaf
Prunus virginiana near view of flowering twig
Prunus virginiana, near view of flowering twig
Psedera quinquefolia (Parthenocissus quinquefolia) vines and fruits
Psoralea growing
Psoralea showing storage root
Ptelea trifoliata
Ptelea trifoliata fruit
Ptelea trifoliata leaves and fruit
Ptelea trifoliata, winged fruits
Pteridium aquilinum
Pteridium aquilinum
Pteridium aquilinum in forest
Pteridium, frond
Pteris
Pteris in its natural habitat
Ptilota filicina
Pulsatilla
Pulsatilla and Lone oak on the Anoka Sand Plain
Pulsatilla at Fort Snelling
Pulsatilla, close up
Pulsatilla, close up
Pulsatilla hirsutissima
Pulsatilla oak grove in distance on the Anoka Sand Plain
Pulsatilla on Anoka Sand Plain, three bur oaks
Purse Gall of Amelanchier leaf
Pycnanthemum virginianum
Pyrola americana
Pyrola asarifolia
Pyrola asarifolia
Pyrus malus flowers (Malus domesita)
Quartzite escarpment
Queen, drone, and worker bees, diagram
Quercus alba leaves
Quercus alba leaves
Quercus alba leaves