List of Canadian plants by family O

Main page: List of Canadian plants by family

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.

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Oedipodiaceae

Oleaceae

Onagraceae

  • 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

Orchidaceae

Orobanchaceae

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

Oxalidaceae

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