Asteraceae (Chaenactis)

Protocol Information for:

Label_title:
Chaenactis (douglasii)

Family Names:

Family Scientific Name:
Asteraceae

Family Common Name:
Sunflower Family

Scientific Names:

Genus:
Chaenactis

Species:
douglasii

Scientific Classification:

Scientific SubSpecies:

Species Authority:
(Hook.) H. & A.

Scientific SubAuthority:

Authors:

Derek Tilley

Common Synonym:

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Species:

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Other Information:

Common Name:
Douglas' dustymaiden

Species Code:
CHDO

Ecotype:
Intermountain West and Rocky Mountains

General Distribution:
Throughout western North America at elevations from 1,000- 3,000 m (3,000- 10,000 ft) from British Columbia to Arizona, ranging as far east as South Dakota. Variety douglasii is known in and east of the Sierra and Cascade ranges extending to the western edge of northern Great Plains.

Known Invasiveness:

Propagation Goal:
plants

Propagation Method:
seed

Product Type:
Container (plug)

Stock Type:

Grow Time:
Weeks

Target Specifications:

Propagation Collection:
Seed can be collected by hand, combine, flailvac, or vacuum-type harvester. We use a "jet combine" to harvest seed production fields. This ensures that only ripe seed is harvested and allows for multiple harvests during the seasonSeed readily disarticulates from flower heads when ripe.

Propagation Processing/Propagule Characteristics:
Seed is air dried prior to processing. Seed can be removed from stems using a hammer mill with a 0.6 cm (0.25 in) screen; however this may not be necessary if seed is collected carefully with a vacuum harvester. Pappus can be removed from the achenes with the use of a debearder or brush machine. Seed is then cleaned with a multi-deck airscreen cleaner followed by an indent cleaner. There are approximately 450,000 seeds/lb.

Pre-Planting Propagule Treatments:
We tested cold/moist stratification at 36ø F for 0, 30, 60 and 90 days. The highest germination was obtained with the 90 and 60 day stratification periods (30.5 and 27.0 %). These did not significantly differ from one another. The 90 and 60 day treatments yielded significantly greater germination rates than the other two treatments. The 30 day stratification treatment (14.0%) likewise yielded better germination than the non-stratified control (0.5%).

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References:

Citation:
Tilley, Derek. 2013. Propagation protocol for production of Container (plug) Chaenactis douglasii (Hook.) H. & A. plants USDA NRCS - Aberdeen Plant Materials Center Aberdeen, Idaho. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/08/02). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.

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