Plants with yellow or green flowers

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Nuphar lutea

(Yellow Pond Lily)

Oenothera biennis

(Yellow Evening Primrose)

Oenothera flava

(Low Yellow Evening Primrose)

Oenothera serrulata

(Shrubby Evening Primrose)


Opuntia fragilis

(Brittle Prickly-Pear Cactus)

Opuntia polyacantha

(Prickly-Pear Cactus)

Orthocarpus luteus

(Owl's-Clover)

Osmorhiza berteroi

(Western Sweet Cicely)


Osmorhiza depauperata

Blunt-Fruited Cicely

Oxytropis campestris

(Early Yellow Locoweed)

Oxytropis monticola

(Late Yellow Locoweed)

Packera cana

(Silvery Groundsel)


Packera paupercula

(Balsam Groundsel)

Parietaria pensylvanica

(Pellitory)

Paronychia sessiliflora

(Low Whitlowwort)

Pastinaca sativa

(Wild Parsnip)


Physaria arenosa

(Sand Bladderpod)

Physaria reediana

(Alpine Bladderpod)

Picradeniopsis oppositifolia

(Opposite-Leaved Bahia)

Platanthera aquilonis

(Green Bog Orchid)


Platanthera obtusata

(Blunt-Leaved Bog Orchid)

Platanthera orbiculata

(Round-Leaved Bog Orchid)

Polygonatum biflorum

(Solomon's-seal)

Polygonum polygaloides
ssp. confertiflorum

(White-Margined Knotweed)

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