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Hymenopappus filifolius

Hymenopappus filifolius (Threadleaf Sunflower)
Asteraceae (Sunflower Family)

Semi-desert, foothills. Woodlands, openings. Spring.
Canyons of the Ancients National Monument, May 14, 2004.

Very fine thread-like mounds of leaves are evident for weeks before tall slender stalks arise and are then topped by several small yellow flower heads. Hymenopappus filifolius, like so many Asteraceae composed only of disk flowers, is easily overlooked.

"Hymenopappus" refers to the membranous, scale-like pappus and "filifolius" is from the Latin "fili", "thread" and "folius", "leaf".

The botanist David Douglas (of Douglas Fir fame) was the first to collect this plant for science and he did so along the Columbia River "near Wallawallah" in the late 1820s. The plant was described and named by William Jackson Hooker in his Flora Boreali-Americana in 1833.

See Hymenopappus newberryi.

Hymenopappus filifolius

Hymenopappus filifolius

Hymenopappus filifolius (Threadleaf Sunflower)
Asteraceae (Sunflower Family)

Semi-desert, foothills. Woodlands, openings. Spring.
Behind the Rocks Wilderness Study Area, Utah, April 23, 2006.

The first photograph shows basal leaves of a very young plant; the second shows a plant many years old.  The gray stems are last year's flower stems. Basal leaves can be confused with those of Chaenactis douglasii variety douglasii.

Hymenopappus filifolius

Hymenopappus filifolius

Hymenopappus filifolius

Hymenopappus filifolius

Hymenopappus filifolius (Threadleaf Sunflower)
Asteraceae (Sunflower Family)

Semi-desert, foothills. Woodlands, openings. Spring.
Hunter Canyon, Utah, May 3, 2005  and Canyons of the Ancients National Monument, May 31, 2010 and May 26, 2011.

Flowers range from golden yellow to lemon yellow and there are only disk flowers. Phyllaries can be glabrous or hairy.

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 Hymenopappus filifolius