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Pterygophora
Pterygophora
Pterygophora
Pterygophora
Pterygophora
Pterygophora
Pterygophora
Pterygophora
Pterygophora californica
Pterygophora holdfast
Pterygophora holdfast
Pterygophora holdfast
Pterygophora holdfast
Pterygophora holdfast
Pterygophora holdfast
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pterygophora stipe
Pulsatilla hirsutissima (Anemone patens)
Pulsatilla hirsutissima (Anemone patens)
Pustularia
Pyrenopsis schaereri (Psorotichia schaereri)
Pyrenula
Pyrenula
Pyrenula leucoplaca (Eopyrenula leucoplaca)
Pyrenula punctiformis (Naetrocymbe punctiformis)
Pyrenula punctiformis (Naetrocymbe punctiformis)
Pyrola rotundifolia
Pyrola secunda (Orthilia secunda)
Pyrola secunda (Orthilia secunda)
Pyxine sorediata
Pyxine sorediata
Quercus
Quercus
Quercus alba
Quercus and Cercocarpus
Quercus coccinea
Quercus coccinea
Quercus macrocarpa (Quercus iberica)
Quercus macrocarpa (Quercus iberica)
Quercus macrocarpa (Quercus iberica)
Quercus macrocarpa (Quercus iberica)
Quercus macrocarpa (Quercus iberica)
Quercus macrocarpa (Quercus iberica)
Quercus macrocarpa (Quercus iberica)
Quercus platanoides
Quercus rubra
Quercus seeding
Quercus velutina
Racomitrium
Ralfsia deusta
Ramalina
Ramalina calicaris fastigiata
Ramalina pusilla
Ramalina pusilla
Ranunculus
Ranunculus
Ranunculus
Ranunculus
Ranunculus
Ranunculus
Ranunculus
Ranunculus abortivus
Ranunculus lyalli
Ranunculus lyalli, Aspidium aculeatum (Polystichum muricatum), Gaya lyallii
Raoulia eximia
Raoulia mammillaris
Raoulia mammillaris
Raoulia mammillaris and Celmisia spectabilis
Ratibida columnaris (Ratibida columnifera)
Ratibida columnaris (Ratibida columnifera)
Ratibida columnaris (Ratibida columnifera)
Ratibida pinnata
Ravenala madagascariensis
Ravine in the Knife River woods
Razaumofskia pusilla (Razoumoeskya)
Razaumofskia pusilla (Razoumoeskya)
Razoumoeskya tsugensis
Razoumoeskya tsugensis
Reforestation
Region of the Kicking Horse, Canadian Pacific Railroad
Rhodomela
Rhodomela lycopodioides
Rhus glabra
Rhus glabra, winter condition
Rhus hirta (Rhus typhina)
Rhus radicans (Toxicodendron radicans)
Rhus vernix (Sorindeia madagascariensis)
Rhus vernix (Sorindeia madagascariensis)
Ribes
Ribes floridum (Ribes americanum)
Ribes prostratum