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Packera werneriifolia

Packera werneriifolia
Asteraceae (Sunflower Family)

Subalpine, alpine. Meadows, tundra, scree. Summer.
Sharkstooth Trail, July 18, 2005.

Packera werneriifolia is typically found above tree-line in rocky soils.  It often forms foot diameter tight clusters of numerous dark green leaves and dozens of yellow and gold flowers.  It frequently is in the company of Senecio fremontii which also forms a dense mat topped by very similar appearing flowers.  S. fremontii can be distinguished from P. werneriifolia by carefully observing the leaves: those of S. fremontii are light green, sessile, prominently toothed, and succulent appearing.  Those of P. werneriifolia are dark green, petioled, finely toothed, and thinner.

"Werneriifolia" means "with leaves similar to those of the Asteraceae genus, Werneria", a species not found in the United States.  Abraham Gottlieb Werner (1749-1817) was a German geologist.

Hall and Harbour collected this species in Colorado in 1862 and in 1864 Asa Gray named it Senecio aureus, variety werneriaefolius, changing it to Senecio werneriaefolius in 1883.  In 1981 Weber and Löve published their reasoning for changing the genus to "Packera" and the species to "werneriaefolia" and eventually the specific epithet spelling was changed to "werneriifolia".  (More biographical information about Werner.) John Packer is a Canadian botanist.  (More biographical information about Packer.)

Packera werneriifolia
Asteraceae (Sunflower Family)

Subalpine, alpine. Meadows, tundra, scree. Summer.
Sharkstooth Trail, July 14, 2006.

Packera werneriifolia 
Asteraceae (Sunflower Family)

Subalpine, alpine. Meadows, tundra, scree. Summer.
Sharkstooth Trail, July 18, 2005.

Range map © John Kartesz,
Floristic Synthesis of North America

State Color Key

Species present in state and native
Species present in state and exotic
Species not present in state

County Color Key

Species present and not rare
Species present and rare
Species extirpated (historic)
Species extinct
Species noxious
Species exotic and present
Native species, but adventive in state
Eradicated
Questionable presence

Range map for Packera werneriifolia