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Nuphar advena (Nuphar lutea)
Nymphaea advena (Nuphar advena)
Oak and light relation on the shore of Vadnais Lake
Oak Bullet smooth Gall of Quercus alba
Oak Club Gall of Quercus alba
Oakesia
Oakesia sessilifolia (Uvularia sessilifolia)
Oakesia sessilifolia (Uvularia sessilifolia)
Oak Lead Seed Gall of Red Oak
Oak Pea Gall of Quercus macrocarpa (Quercus iberica)
Oenothera biennis
Oenothera macrocarpa, close up
Oenothera rhombipetala spreading
O'Hare's Homestead on the Little Fork River
Old bank vault, Keota, Colorado
Old Blowout, vegetation advancing
Old Blue Heron Near Nest
Old Faithful Geyser
Old Faithful Inn
Old Man of the St. Croix
Old Man of the St. Croix, close up
Olympic Peninsula on the Washington Highway
One egg left after hail
One of the Wylie Coaches
Onoclea sensibilis
Onoclea sensibilis
Onoclea sensibilis
Onoclea sensibilis
Onoclea sensibilis in Vadnais Lake Swamp
Ophioglossum vulgatum (Ophioglossum reticulatum)
Opuntia and Mamillaria cacti in home garden
Opuntia and Mamillaria cacti in home garden
Opuntia fragilis cactus
Opuntia fragilis cactus, close view
Opuntia fragilis cactus on stone steps near the Botany Greenhouse
Opuntia humifusa fruiting
Opuntia rafinesquii in flower
Opuntia rafinesquii in flower
Orchid
Orchis rotundifolia (Amerorchis rotundifolia)
Orchis rotundifolia (Amerorchis rotundifolia)
Orchis rotundifolia (Amerorchis rotundifolia), near view
Orchis spectabilis
Orchis spectabilis
Oscillatoria, etc.
Osmorhiza fruits on stem
Osmunda cinnamomea
Osmunda cinnamomea
Osmunda cinnamomea
Osmunda cinnamomea