[Dustymaidens: The Genus Chaenactis East of the Cascade Mountains of Oregon and Washington]

Douglas' Dustymaidens, Dustymaidens, Dusty Maidens, Hoary False Yarrow

Chaenactis douglasii var. douglasii

Synonyms: Chaenactis douglasii var. achilleaefolia, Chaenactis douglasii var. achilleifolia, Chaenactis douglasii var. montana, Chaenactis douglasii var. rubricaulis, Chaenactis pedicularis, Chaenactis ramosa, Chaenactis rubricaulis

Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii

The photo above shows a close-up of the flower head of hoary flase yarrow as seen from steep ash slopes above the John Day River along Oregon Highway 19 at milepost 80 in central Oregon............May 28, 2007.

Seed head of Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasiiThe photo at right shows the seed head of the hoary false yarrow.
Characteristics:

Hoary false yarrow is an upright wildflower with cottony, lacy pinnate leaves. The one to several stems are erect, relatively straight, and often unbranched. Plants arise 10-60 cm in height. The leaves are bipinnate to pinnately dissected (See photo below). The leaf segments are thick and curled, so the leaves do not look flat.

The inflorescence is a flat-topped corymb. There are several to many white or pink-tinged disk flowers which look like pincushions. Individual plants grow up to 1.5 feet tall. Flowers from May into September.


Varieties of Hoary False Yarrow:

var. douglasii - Found across the range of the species although largely replaced by variety glandulosa in the Blue Mts.

var. glandulosa - Found across the Blue Mts. of northeastern Oregon and southeastern Washington.


Habitat:

Hoary false yarrow may be found on dry, rocky or sandy soils from the lowlands to timberline in the mountains.


Range:

Hoary false yarrow may be found from southern British Columbia to southern California, east of the Cascade and Sierra Nevada ranges, east to Colorado and northern Arizona.


Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii

Hoary false yarrow as seen along US Highway 395 in Silvies Valley, central Oregon..........August 8, 2014.

Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii

The photo above shows a close-up of the involucral bracts of hoary false yarrow as seen from steep ash slopes above the John Day River along Oregon Highway 19 at milepost 80 in central Oregon........May 28, 2007. Note how densely hairy the bracts are.

Basal leaf rosette of a second year plant of Douglas' Dustymaidens, Dustymaidens, Dusty Maidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii (Synonyms: Chaenactis douglasii var. achilleaefolia, Chaenactis douglasii var. achilleifolia, Chaenactis douglasii var. montana, Chaenactis douglasii var. rubricaulis, Chaenactis pedicularis, Chaenactis ramosa, Chaenactis rubricaulis) - Basal leaf rosette of Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii

The photo at left shows the basal leaf rosette and lower stem leaves of hoary false yarrow as observed on ashy, alkaline soils along the Pinnacles Trail several miles downstream along the John Day River from the campground at Cottonwood Canyon State Park......March 5, 2020. The photo at right shows the attractive rosette of basal leaves of hoary false yarrow as seen in the Columbia Hills........July 7, 2006. This two is a second year plant which will die once it has flowered and set seed during the summer of it's second year.

Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii

The photo above shows hoary flase yarrow as seen from steep, ash slopes above the John Day River along Oregon Highway 19 at milepost 80 in central Oregon.........May 28, 2007.

Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii - Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii

Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii - Douglas' Dustymaiden, Dustymaidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii

Dustymaidens as seen near the shoreline of Banks Lake at the Million Dollar Boat Launch, Grant County, Washington..........June 2, 2013.

Douglas' Dustymaidens, Dustymaidens, Dusty Maidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii (Synonyms: Chaenactis douglasii var. achilleaefolia, Chaenactis douglasii var. achilleifolia, Chaenactis douglasii var. montana, Chaenactis douglasii var. rubricaulis, Chaenactis pedicularis, Chaenactis ramosa, Chaenactis rubricaulis) - Flower head of Douglas' Dustymaidens, Dustymaidens, Dusty Maidens, Hoary False Yarrow: Chaenactis douglasii var. douglasii (Synonyms: Chaenactis douglasii var. achilleaefolia, Chaenactis douglasii var. achilleifolia, Chaenactis douglasii var. montana, Chaenactis douglasii var. rubricaulis, Chaenactis pedicularis, Chaenactis ramosa, Chaenactis rubricaulis)

Dustymaidens blooming on Bickleton Ridge in the Bickleton Ridge Unit of the Klickitat Wildlife Area........June 17, 2017.

Paul Slichter