Thymophylla pentachaeta, Fiveneedle Pricklyleaf
Scientific Name: Thymophylla pentachaeta
Common Name: Fiveneedle Pricklyleaf
Also called: Dahlberg daisy, Dogweed, Five-needle Pricklyleaf, Fiveneedle Fetid Marigold, Golden Dyssodia, Golden Fleece
Family: Asteraceae, Sunflower Family
Synonyms: (Dyssodia pentachaeta)
Duration: Annual or perennial.
Size: Up to 1 foot.
Growth Form: Forb/herb, subshrub; erect or spreading, mounded or tufted profile, multiple stems, grayish-green or green, stem surfaces covered with dense or scattered hairs (pubescent) or completely devoid of surface hairs (glabrous).
Leaves: Green; leafy, mostly opposite, margins pinnately divided or lobed, narrowly linear or threadlike (filiform), lobes-glandular.
Flower Color: Yellow or golden-yellow; daisy-type flowers ½ inch, single radiate head on tip of leafless inflorescence up to 1 ½ inches long; ray flowers 8 to 20, numerous disk flowers; bracts (phyllaries) around "flower" heads is also glandular; fruit an achene.
Flowering Season: March to October, spring and throughout late summer and fall with monsoon rainfall
Elevation: 2,500 to 4,500 feet.
Habitat Preferences: Various habitats, lower and upper desert areas, dry slopes, rocky hillsides and mesas.
Recorded Range: Throughout the southwestern United States in AZ, CA, NM, NV, TX, UT and in northern Mexico. In most of Arizona, may be absent in Yuma County and in the northeast part of the state.
North America & US County Distribution Map for Thymophylla pentachaeta.
U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.
Thymophylla pentachaeta, var. hartwegii, Hartweg's Pricklyleaf, (AZ, NM, TX);
Thymophylla pentachaeta, var. belenidium, Fiveneedle Pricklyleaf, (AZ, CA, NM, NV, TX, UT);
Thymophylla pentachaeta, var. pentachaeta, Fiveneedle Pricklyleaf, (NM, SC and TX) and;
Thymophylla pentachaeta, var. puberula, Fiveneedle Pricklyleaf (TX).
Comments: Fiveneedle Pricklyleaf or Golden Dyssodia is an eastern Mojave Desert and Lower Colorado River Basin of the Sonoran Desert species that once belonged to the genus Dyssodia. This species is similar to Pricklyleaf Dogweed, Thymophylla acerosa which is smaller and has more linear leaves.
This is an ideal landscape plant that attracts butterflies and provides a natural look in desert areas although it is self-seeding and will spread if not managed. This species has a longer blooming season with ample water and warmer winters. Dogweeds are known for having strong odors, often fetid or otherwise offensive, not typically pleasant.
Photographs above taken September 12, near San Manuel, Pinal County, Arizona.