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U.S. Forest Service

Plant of the Week

Enjoy Your Wildflowers

Thousands of wildflowers grow on our national forests and grasslands, in many shapes, sizes, and colors. A field of wildflowers or colorful plants upon a lush forest floor is a beautiful sight, but so is a single flower or scattered plants growing upon what at first glance may appear to be a dry and desolate landscape.

Celebrating Wildflowers periodically features a different wildflower plant found on our national forests and grasslands.

The Plant of the Week descriptions are organized alphabetically by genus and species.

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  All

Gallery: O

Tufted evening-primrose Tufted evening-primrose (Oenothera caespitosa)

Showy Evening Primrose (Oenothera speciosa). Showy Evening Primrose (Oenothera speciosa)

Devil's Club (Oplopanax horridus). Devil's Club (Oplopanax horridus)

Prickly pear cactus. Prickly Pear (Opuntia basilaris)

Eastern Prickly Pear (Opuntia humifusa). Eastern Prickly Pear (Opuntia humifusa)

Great Plains Prickly Pear (Opuntia polyacantha). Great Plains Prickly Pear (Opuntia polyacantha)

One-flowered Cancer Root (Orobanche uniflora). One-flowered Cancer Root (Orobanche uniflora)

Redwood Sorrel (Oxalis oregana). Redwood Sorrel (Oxalis oregana)

Common Yellow Wood Sorrel (Oxalis stricta). Common Yellow Wood Sorrel (Oxalis stricta)