Common name begins with:A,
B,
C,
D,
E,
F,
G,
H,
I,
J,
K,
L,
M,
N,
O,
P,
Q,
R,
S,
T,
U,
V,
W,
X,
Y,
Z
Names beginning with O: oak,
oak-fern,
oat,
oatgrass,
ocean-spray,
oenanthe,
oenothera,
old man in the spring,
old-man's beard,
old-man's-beard,
oldman,
oldwoman,
olive,
Omphalina,
onion,
oniongrass,
ookow,
orach,
orache,
oracle,
orange wall lichen,
orange-peel,
orchid,
Oregon-grape,
Oregon-tea,
oreocarya,
Osage-orange,
osier,
oso-berry,
ovalpurse,
owl-clover,
oxtongue,
oyster,
oysterette,
oysterling
Oak
British oak (
Quercus robur) – 8 photos
English oak (
Quercus robur) – 8 photos
Garry oak (
Quercus garryana) – 30 photos
Garry oak (
Quercus garryana var.
garryana) – 23 photos
Jerusalem oak (
Dysphania botrys) – 24 photos
Oregon white oak (
Quercus garryana) – 30 photos
Oregon white oak (
Quercus garryana var.
garryana) – 23 photos
red oak (
Quercus rubra) – 6 photos
Oak-fern
Pacific oak-fern (
Gymnocarpium disjunctum) – 17 photos
western oak-fern (
Gymnocarpium disjunctum) – 17 photos
Oat
barbed oat (
Avena barbata) – 11 photos
narrow false oat (
Trisetum spicatum) – 6 photos
oat (
Avena sativa) – 8 photos
tall false oat (
Trisetum canescens) – 1 photo
wild oat (
Avena fatua) – 24 photos
Oatgrass
California oatgrass (
Danthonia californica) – 18 photos
few-flower oatgrass (
Danthonia unispicata) – 16 photos
one-spike oatgrass (
Danthonia unispicata) – 16 photos
poverty oatgrass (
Danthonia spicata) – 10 photos
tall oatgrass (
Arrhenatherum elatius) – 34 photos
timber oatgrass (
Danthonia intermedia) – 4 photos
Ocean-spray
creambush ocean-spray (
Holodiscus discolor) – 74 photos
hillside ocean-spray (
Holodiscus discolor) – 74 photos
ocean-spray (
Holodiscus discolor) – 74 photos
Oenanthe
oenanthe (
Oenanthe sarmentosa) – 34 photos
Oenothera
oenothera (
Oenothera) – 3 photos
Old man in the spring
old man in the spring (
Senecio vulgaris) – 21 photos
Old-man's beard
old-man's beard (
Clematis vitalba) – 30 photos
Old-man's-beard
old-man's-beard (
Hericium erinaceus) – 2 photos
Oldman
oldman (
Artemisia absinthium) – 19 photos
Oldwoman
oldwoman (
Artemisia stelleriana) – 3 photos
Olive
autumn olive (
Elaeagnus umbellata) – 16 photos
Omphalina
Wynne's Omphalina (
Chrysomphalina grossula) – 6 photos
Onion
Blue Mountain onion (
Allium dictuon) – 1 photo
Columbia onion (
Allium columbianum) – 13 photos
Cuddy Mountain onion (
Allium fibrillum) – 38 photos
Douglas' onion (
Allium douglasii) – 24 photos
fragile onion (
Allium scilloides) – 42 photos
fringed onion (
Allium fibrillum) – 38 photos
Geyer's onion (
Allium geyeri) – 3 photos
Geyer's onion (
Allium geyeri var.
geyeri) – 10 photos
Grand Coulee onion (
Allium constrictum) – 17 photos
narrow-leaf onion (
Allium amplectens) – 16 photos
Nevius's onion (
Allium nevii) – 57 photos
nodding onion (
Allium cernuum) – 29 photos
Olympic onion (
Allium crenulatum) – 50 photos
Pacific onion (
Allium validum) – 19 photos
Robinson's onion (
Allium robinsonii) – 35 photos
rock onion (
Allium macrum) – 29 photos
rosy Sierra onion (
Allium campanulatum) – 7 photos
Rydberg's onion (
Allium geyeri var.
tenerum) – 9 photos
scalloped onion (
Allium crenulatum) – 50 photos
scilla-like onion (
Allium scilloides) – 42 photos
swamp onion (
Allium validum) – 19 photos
taper-tip onion (
Allium acuminatum) – 100 photos
textile onion (
Allium textile) – 4 photos
Tolmie's onion (
Allium tolmiei) – 7 photos
Tolmie's onion (
Allium tolmiei var.
tolmiei) – 19 photos
twinleaf onion (
Allium anceps) – 4 photos
two-edged onion (
Allium anceps) – 4 photos
white wild onion (
Allium textile) – 4 photos
Oniongrass
Alaska oniongrass (
Melica subulata) – 19 photos
Ookow
ookow (
Dichelostemma congestum) – 32 photos
Orach
Gmelin's saltbush orach (
Atriplex gmelinii var.
gmelinii) – 6 photos
orach (
Atriplex gmelinii var.
gmelinii) – 6 photos
orach (
Atriplex heterosperma) – 24 photos
red orach (
Atriplex rosea) – 16 photos
Russian atriplex orach (
Atriplex heterosperma) – 24 photos
tumbling orach (
Atriplex rosea) – 16 photos
Orache
garden orache (
Atriplex hortensis) – 5 photos
Gmelin's orache (
Atriplex gmelinii) – 1 photo
halberdleaf orache (
Atriplex patula) – 12 photos
hastate orache (
Atriplex prostrata) – 18 photos
long-stalked orache (
Atriplex longipes) – 2 photos
silver orache (
Atriplex argentea) – 6 photos
silverscale orache (
Atriplex argentea) – 6 photos
thickleaf orache (
Atriplex dioica) – 8 photos
thin-leaf orache (
Atriplex prostrata) – 18 photos
wedge orache (
Atriplex truncata) – 7 photos
wedgeleaf orache (
Atriplex truncata) – 7 photos
wedgescale orache (
Atriplex truncata) – 7 photos
Oracle
spear oracle (
Atriplex patula) – 12 photos
Orange wall lichen
elegant orange wall lichen (
Rusavskia elegans) – 6 photos
Orange-peel
orange-peel (
Aleuria aurantia) – 8 photos
Orchid
Alaska rein orchid (
Platanthera unalascensis) – 39 photos
boreal bog orchid (
Platanthera dilatata) – 40 photos
canyon bog orchid (
Platanthera sparsiflora) – 10 photos
canyon bog orchid (
Platanthera stricta) – 45 photos
choriso bog orchid (
Platanthera chorisiana) – 6 photos
dense orchid (
Platanthera elongata) – 19 photos
dense-flower rein orchid (
Platanthera elongata) – 19 photos
eagle rein orchid (
Platanthera aquilonis) – 5 photos
elegant rein orchid (
Platanthera elegans ssp.
elegans) – 15 photos
fen orchid (
Liparis loeselii) – 1 photo
hillside rein orchid (
Platanthera elegans ssp.
elegans) – 15 photos
large round-leaf orchid (
Platanthera orbiculata) – 34 photos
long-bracted orchid (
Dactylorhiza viridis) – 12 photos
needle-spur green orchid (
Platanthera stricta) – 45 photos
northern green bog orchid (
Platanthera huronensis) – 15 photos
phantom orchid (
Cephalanthera austiniae) – 34 photos
royal rein orchid (
Platanthera transversa) – 48 photos
Sheviak's bog orchid (
Platanthera aquilonis) – 5 photos
slender bog orchid (
Platanthera stricta) – 45 photos
white bog orchid (
Platanthera dilatata var.
dilatata) – 23 photos
white bog orchid (
Platanthera dilatata var.
leucostachys) – 10 photos
white orchid (
Platanthera dilatata) – 40 photos
white rein orchid (
Platanthera dilatata) – 40 photos
white-lip rein orchid (
Platanthera ephemerantha) – 8 photos
Oregon-grape
Cascade Oregon-grape (
Mahonia nervosa) – 47 photos
creeping Oregon-grape (
Mahonia repens) – 36 photos
dull Oregon-grape (
Mahonia nervosa) – 47 photos
holly-leaf Oregon-grape (
Mahonia aquifolium) – 66 photos
low Oregon-grape (
Mahonia repens) – 36 photos
shining Oregon-grape (
Mahonia aquifolium) – 66 photos
tall Oregon-grape (
Mahonia aquifolium) – 66 photos
Oregon-tea
Oregon-tea (
Clinopodium douglasii) – 21 photos
Oreocarya
cockscomb oreocarya (
Oreocarya glomerata) – 33 photos
Sheldon's oreocarya (
Oreocarya glomerata) – 33 photos
Osage-orange
Osage-orange (
Maclura pomifera) – 6 photos
Osier
western red osier (
Cornus occidentalis) – 14 photos
Oso-berry
oso-berry (
Oemleria cerasiformis) – 46 photos
Ovalpurse
ovalpurse (
Hornungia procumbens) – 36 photos
Owl-clover
dwarf owl-clover (
Triphysaria pusilla) – 12 photos
golden-tongue owl-clover (
Orthocarpus luteus) – 16 photos
Grand Coulee owl-clover (
Orthocarpus barbatus) – 27 photos
mountain owl-clover (
Orthocarpus imbricatus) – 22 photos
narrow-leaved owl-clover (
Orthocarpus tenuifolius) – 17 photos
rosy owl-clover (
Orthocarpus bracteosus) – 13 photos
thin-leaved owl-clover (
Orthocarpus tenuifolius) – 17 photos
Oxtongue
hawkweed oxtongue (
Picris hieracioides) – 3 photos
oxtongue (
Helminthotheca echioides) – 4 photos
Oyster
leaflike oyster (
Hohenbuehelia petaloides) – 2 photos
oak oyster (
Pleurotus dryinus) – 6 photos
shoehorn oyster (
Hohenbuehelia petaloides) – 2 photos
smelly oyster (
Phyllotopsis nidulans) – 7 photos
veiled oyster (
Pleurotus dryinus) – 6 photos
Oysterette
white oysterette (
Cheimonophyllum candidissimum) – 3 photos
Oysterling
bitter oysterling (
Panellus stipticus) – 4 photos
lilac oysterling (
Panus conchatus) – 4 photos
peeling oysterling (
Crepidotus mollis cf.) – 2 photos