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Packera cana (Woolly groundsel)
Reveal, James L.

Packera cana

Packera cana (Hook.) W.A. Weber & Á. Löve

Woolly Groundsel, Silver-woolly Groundsel, Gray Ragwort

Asteraceae (Aster Family)

Synonym(s): Senecio canus, Senecio convallium, Senecio hallii, Senecio hallii var. discoidea, Senecio harbourii, Senecio howellii, Senecio purshianus

USDA Symbol: PACA15

USDA Native Status: L48 (N), CAN (N)

A slender-stemmed, clumped perennial, 4-12 in. high, with whitish foliage and flat, terminal clusters of yellow radiate flowers. Clumps in cultivation and disturbed areas can be 10 in. across, smaller when competing with other plants.


From the Image Gallery

7 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Size Notes: Up to about 1 foot tall.
Leaf: Dark Green
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: Yellow
Bloom Time: May , Jun , Jul , Aug


USA: CA , CO , ID , KS , MN , MT , ND , NE , NM , NV , OR , SD , UT , WA , WY
Canada: AB , BC , MB , SK
Native Distribution: CA to B.C., e. to Sask., the w. Dakotas & the Rockies
Native Habitat: Dry, rocky, cold, open plains

Growing Conditions

Water Use: Low
Light Requirement: Sun
Soil Moisture: Dry
CaCO3 Tolerance: Medium
Soil Description: Rocky soils.


Conspicuous Flowers: yes

Find Seed or Plants

Find seed sources for this species at the Native Seed Network.

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Native Seed Network - Corvallis, OR

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Additional resources

USDA: Find Packera cana in USDA Plants
FNA: Find Packera cana in the Flora of North America (if available)
Google: Search Google for Packera cana


Record Modified: 2022-12-30
Research By: TWC Staff

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