List of Canadian plants by family O

"Main page:" List of Canadian plants by family

Families:
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

Oedipodiaceae

* "Oedipodium griffithianum"

Oleaceae

* "Fraxinus americana" — white ash
* "Fraxinus latifolia" — Oregon ash
* "Fraxinus nigra" — black ash
* "Fraxinus pennsylvanica" — green ash
* "Fraxinus profunda" — pumpkin ash
* "Fraxinus quadrangulata" — blue ash

Onagraceae

* "Boisduvalia densiflora" — denseflower spike-primrose
* "Boisduvalia glabella" — smooth spike-primrose
* "Calylophus serrulatus" — yellow evening-primrose
* "Camissonia andina" — Blackfoot River suncup
* "Camissonia breviflora" — shortflower suncup
* "Camissonia contorta" — dwarf contorted suncup
* "Circaea alpina" — small enchanter's-nightshade
* "Circaea lutetiana" — southern broadleaf enchanter's-nightshade
* "Circaea x intermedia" — intermediate enchanger's-nightshade
* "Clarkia amoena" — farewell-to-spring
* "Clarkia pulchella" — largeflower clarkia
* "Clarkia purpurea" — winecup clarkia
* "Clarkia rhomboidea" — tongue clarkia
* "Epilobium anagallidifolium" — alpine willowherb
* "Epilobium angustifolium" — fireweed
* "Epilobium arcticum" — arctic willowherb
* "Epilobium brachycarpum" — panicled willowherb
* "Epilobium ciliatum" — hairy willowherb
* "Epilobium clavatum" — clavate-fruit willowherb
* "Epilobium coloratum" — purpleleaf willowherb
* "Epilobium davuricum" — Dahuria willowherb
* "Epilobium foliosum" — California willowherb
* "Epilobium glaberrimum" — glaucous willowherb
* "Epilobium halleanum" — glandular willowherb
* "Epilobium hornemannii" — Hornemann's willowherb
* "Epilobium lactiflorum" — whiteflower willowherb
* "Epilobium latifolium" — river beauty
* "Epilobium leptocarpum" — slender-fruited willowherb
* "Epilobium leptophyllum" — linear-leaved willowherb
* "Epilobium luteum" — yellow willowherb
* "Epilobium minutum" — smallflower willowherb
* "Epilobium mirabile" — Olimple Mountain willowherb
* "Epilobium oregonense" — Oregon willowherb
* "Epilobium palustre" — marsh willowherb
* "Epilobium saximontanum" — Rocky Mountain willowherb
* "Epilobium strictum" — downy willowherb
* "Epilobium x wisconsinense"
* "Gaura biennis" — biennial gaura
* "Gaura coccinea" — scarlet gaura
* "Gayophytum diffusum" — diffuse groundsmoke
* "Gayophytum humile" — low groundsmoke
* "Gayophytum racemosum" — racemed groundsmoke
* "Gayophytum ramosissimum" — much-branch groundsmoke
* "Ludwigia alternifolia" — bushy seedbox
* "Ludwigia palustris" — marsh seedbox
* "Ludwigia polycarpa" — many-fruit false-loosestrife
* "Oenothera biennis" — common evening-primrose
* "Oenothera caespitosa" — tufted evening-primrose
* "Oenothera clelandii" — lesser four-point evening-primrose
* "Oenothera elata" — Hooker's evening-primrose
* "Oenothera flava" — long-tubed evening-primrose
* "Oenothera fruticosa" — narrowleaf sundrops
* "Oenothera nuttallii" — white-stemmed evening-primrose
* "Oenothera oakesiana" — Oakes' evening-primrose
* "Oenothera pallida" — pale evening-primrose
* "Oenothera parviflora" — northern evening-primrose
* "Oenothera perennis" — small sundrops
* "Oenothera pilosella" — meadow evening-primrose
* "Oenothera villosa" — hairy evening-primrose

Ophioglossaceae

* "Botrychium acuminatum" — moonwort
* "Botrychium ascendens" — upward-lobed moonwort
* "Botrychium boreale" — northern moonwort
* "Botrychium campestre" — prairie dunewort
* "Botrychium crenulatum" — crenulate moonwort
* "Botrychium dissectum" — cutleaf grapefern
* "Botrychium hesperium" — western moonwort
* "Botrychium lanceolatum" — triangle grapefern
* "Botrychium lineare" — narrowleaf grapefern
* "Botrychium lunaria" — moonwort grapefern
* "Botrychium matricariifolium" — chamomile grapefern
* "Botrychium minganense" — Mingan's moonwort
* "Botrychium montanum" — mountain moonwort
* "Botrychium mormo" — little goblin moonwort
* "Botrychium multifidum" — leathery grapefern
* "Botrychium oneidense" — bluntlobe grapefern
* "Botrychium pallidum" — pale moonwort
* "Botrychium paradoxum" — peculiar moonwort
* "Botrychium pedunculosum" — stalked moonwort
* "Botrychium pinnatum" — northern moonwort
* "Botrychium pseudopinnatum" — false daisyleaf grapefern
* "Botrychium rugulosum" — rugulose grapefern
* "Botrychium simplex" — least grapefern
* "Botrychium spathulatum" — spoonleaf moonwort
* "Botrychium tunux"
* "Botrychium virginianum" — rattlesnake fern
* "Botrychium x watertonense"
* "Botrychium yaaxudakeit"
* "Ophioglossum pusillum" — northern adder's-tongue
* "Ophioglossum vulgatum" — southern adder's-tongue

Orchidaceae

* "Amerorchis rotundifolia" — round-leaved orchis
* "Aplectrum hyemale" — puttyroot
* "Arethusa bulbosa" — dragon's mouth
* "Calopogon tuberosus" — tuberous grass-pink
* "Calypso bulbosa" — fairy slipper
* "Cephalanthera austiniae" — phantom orchid
* "Coeloglossum viride" — longbract green orchis
* "Corallorhiza maculata" — spotted coralroot
* "Corallorhiza mertensiana" — Merten's coralroot
* "Corallorhiza odontorhiza" — autumn coralroot
* "Corallorhiza striata" — striped coralroot
* "Corallorhiza trifida" — early coralroot
* "Cypripedium acaule" — pink lady's-slipper
* "Cypripedium arietinum" — ram's-head lady's-slipper
* "Cypripedium candidum" — small white lady's-slipper
* "Cypripedium guttatum" — spotted lady's-slipper
* "Cypripedium montanum" — mountain lady's-slipper
* "Cypripedium parviflorum" — American yellow lady's-slipper
* "Cypripedium passerinum" — sparrow's-egg lady's-slipper
* "Cypripedium reginae" — showy lady's-slipper
* "Cypripedium x andrewsii" — Andrews' lady's-slipper
* "Cypripedium x columbianum" — Columbian lady's-slipper
* "Cypripedium x favillianum"
* "Cypripedium x landonii" — Landon's lady's-slipper
* "Dactylorhiza praetermissa" — southern marsh orchid
* "Epipactis gigantea" — giant helleborine
* "Galearis spectabilis" — showy orchis
* "Goodyera oblongifolia" — giant rattlesnake-plantain
* "Goodyera pubescens" — downy rattlesnake-plantain
* "Goodyera repens" — dwarf rattlesnake-plantain
* "Goodyera tesselata" — checkered rattlesnake-plantain
* "Isotria medeoloides" — small whorled pogonia
* "Isotria verticillata" — large whorled pogonia
* "Liparis liliifolia" — large twayblade
* "Liparis loeselii" — Lösel's twayblade
* "Listera auriculata" — auricled twayblade
* "Listera australis" — southern twayblade
* "Listera borealis" — northern twayblade
* "Listera caurina" — western twayblade
* "Listera convallarioides" — broad-leaved twayblade
* "Listera cordata" — heartleaf twayblade
* "Listera x veltmanii" — Veltman's twayblade
* "Malaxis brachypoda" — white adder's-mouth
* "Malaxis diphyllos" — Aleutian adder's-mouth
* "Malaxis paludosa" — bog adder's-mouth
* "Malaxis unifolia" — green adder's-mouth
* "Piperia candida" — white piperia
* "Piperia elegans" — hillside rein orchid
* "Piperia elongata" — denseflower rein orchid
* "Piperia transversa" — royal rein orchid
* "Piperia unalascensis" — Alaska rein orchid
* "Platanthera albida" — vanilla-scent bog orchid
* "Platanthera aquilonis"
* "Platanthera blephariglottis" — white-fringe orchis
* "Platanthera chorisiana" — Choriso bog orchid
* "Platanthera clavellata" — small green woodland orchid
* "Platanthera dilatata" — leafy white orchis
* "Platanthera flava" — southern rein orchid
* "Platanthera grandiflora" — large purple-fringe orchis
* "Platanthera hookeri" — Hooker's orchis
* "Platanthera hyperborea" — leafy northern green orchid
* "Platanthera lacera" — green-fringe orchis
* "Platanthera leucophaea" — eastern prairie white-fringed orchid
* "Platanthera leucostachys" — scentbottle
* "Platanthera obtusata" — small northern bog orchid
* "Platanthera orbiculata" — large roundleaf orchid
* "Platanthera praeclara" — western prairie white-fringed orchid
* "Platanthera psycodes" — small purple-fringe orchis
* "Platanthera stricta" — slender bog orchid
* "Platanthera x andrewsii" — Andrews' platanthera
* "Platanthera x hollandiae" — Holland's platanthera
* "Platanthera x keenanii" — Keenan's platanthera
* "Platanthera x media"
* "Platanthera x reznicekii" — Reznicek's platanthera
* "Platanthera x vossii" — Voss' platanthera
* "Pogonia ophioglossoides" — rose pogonia
* "Spiranthes casei" — Case's ladies'-tresses
* "Spiranthes cernua" — nodding ladies'-tresses
* "Spiranthes lacera" — southern slender ladies'-tresses
* "Spiranthes lucida" — shining ladies'-tresses
* "Spiranthes magnicamporum" — Great Plains ladies'-tresses
* "Spiranthes ochroleuca" — yellow nodding ladies'-tresses
* "Spiranthes ovalis" — lesser ladies'-tresses
* "Spiranthes romanzoffiana" — hooded ladies'-tresses
* "Spiranthes x intermedia"
* "Spiranthes x simpsonii" — Simpson's ladies'-tresses
* "Triphora trianthophora" — nodding pogonia

Orobanchaceae

* "Boschniakia hookeri" — Vancouver groundcone
* "Boschniakia rossica" — northern groundcone
* "Boschniakia strobilacea" — California groundcone
* "Conopholis americana" — American cancer-root
* "Epifagus virginiana" — beechdrops
* "Orobanche californica" — California broomrape
* "Orobanche corymbosa" — flat-top broomrape
* "Orobanche fasciculata" — clustered broomrape
* "Orobanche ludoviciana" — Louisiana broomrape
* "Orobanche pinorum" — pine broomrape
* "Orobanche uniflora" — one-flowered broomrape

Orthotrichaceae

* "Amphidium californicum"
* "Amphidium lapponicum"
* "Amphidium mougeotii"
* "Drummondia prorepens"
* "Orthotrichum affine"
* "Orthotrichum alpestre"
* "Orthotrichum anomalum"
* "Orthotrichum consimile"
* "Orthotrichum cupulatum"
* "Orthotrichum gymnostomum"
* "Orthotrichum hallii"
* "Orthotrichum laevigatum"
* "Orthotrichum lyellii"
* "Orthotrichum obtusifolium" — blunt bristle-moss
* "Orthotrichum ohioense"
* "Orthotrichum pallens"
* "Orthotrichum pellucidum"
* "Orthotrichum pulchellum"
* "Orthotrichum pumilum"
* "Orthotrichum pusillum"
* "Orthotrichum pylaisii"
* "Orthotrichum rivulare"
* "Orthotrichum rupestre"
* "Orthotrichum sordidum"
* "Orthotrichum speciosum"
* "Orthotrichum stellatum"
* "Orthotrichum stramineum"
* "Orthotrichum strangulatum"
* "Orthotrichum striatum"
* "Orthotrichum tenellum"
* "Ulota coarctata"
* "Ulota crispa"
* "Ulota curvifolia"
* "Ulota drummondii"
* "Ulota hutchinsiae"
* "Ulota megalospora"
* "Ulota obtusiuscula"
* "Ulota phyllantha"
* "Zygodon conoideus"
* "Zygodon gracilis"
* "Zygodon reinwardtii"
* "Zygodon viridissimus"

Osmundaceae

* "Osmunda cinnamomea" — cinnamon fern
* "Osmunda claytoniana" — interrupted fern
* "Osmunda regalis" — royal fern

Oxalidaceae

* "Oxalis dillenii" — Dillen's woodsorrel
* "Oxalis montana" — white woodsorrel
* "Oxalis oregana" — Oregon woodsorrel
* "Oxalis stricta" — common yellow woodsorrel
* "Oxalis suksdorfii" — western yellow oxalis