Xanthisma gracilie, Slender Goldenweed
Scientific Name: Xanthisma gracilie
Common Name: Slender Goldenweed
Also Called: Annual Bristle-weed, Annual Bristleweed (Spanish: Tabacote)
Family: Asteraceae, Sunflower Family
Synonyms: (Machaeranthera gracilis, Dieteria gracilis, Aster gracilis, Aplopappus gracilis, Haplopappus gracilis, Haplopappus ravenii, Sideranthus gracilis)
Size: Up to 15 inches.
Growth Form: Forb/herb; stems 1 to many, stiff branching throughout; most of the plant bristly hairy.
Leaves: Green; bristly hairy; lower leaves pinnately divided or pinnately lobed; tipped with white bristly spine; dried at bloom; upper leaves smaller, narrowly linear; margins and teeth tipped with spines.
Flower Color: Yellow; ray flowers bright yellow with 16 or more florets; disk flowers also numerous; flower heads single or small clusters on tips of stiff branches; bracts surrounding flower heads linear, hairy and spiny; fruit is a small achene, pappus whitish tan.
Flowering Season: February to November.
Elevation: Up to 7,000 feet.
Habitat Preferences: Middle to upper and lower deserts, dry plains, mesas, rocky slopes, sandy areas and roadsides.
Recorded Range: Xanthisma gracilie is native to the southwestern United States in AZ, CA, CO, ME, NM, NV, NY, TX and UT and in northern and central Mexico. Common throughout Arizona in preferred habitats.
North America & US County Distribution Map for Xanthisma gracilie.
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.
Comments: Xanthisma is a complex genus in the sunflower family that has been passed around taxonomically for several decades formerly belonging to Haplopappus, Machaeranthera and Dieteria. All species have yellow flowers and all species are native to Arizona. It is also called Annual Bristle-weed as the plant is covered in small white spiny bristles throughout. In years with ample rainfall, this plant is found in large numbers with its bright yellow flowers.
In Southwest Desert Flora also see Lacy Tansyaster, Xanthisma spinulosum.
Ethno-botanical uses of this plant range from use as lotion for pimples, boils and sores, as a compound for use as an eyewash and as snuff to cause sneezing, clearing congested nose. See species account from Native Native American Ethnobotany, University of Michigan, Dearborn.