Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

Home to the plants of the Sonoran, Chihuahuan and Mojave Deserts

Cirsium ochrocentrum, Yellowspine Thistle

Baccharis pteronioides, Yerba de Pasmo

Yerba de Pasmo has creamy white solitary flowers on terminal leafy branchlets in clusters of 10 to 20; male and female flowers on separate plants. Baccharis pteronioides Yerba de Pasmo is a shrub that grows on erect stems up to 3 feet high with a stiff habit and rough gray bark evenly branched with thick woody crowns. Baccharis pteronioidesYerba de Pasmo blooms from April to September in Arizona and from April to June in California. This species has male and female flowers on separate shrubs. Baccharis pteronioidesYerba de Pasmo is a native shrub that grows up to 3 feet, much shorter than most southwestern shrubs of the genus Baccharis. Yerba de Pasmo prefers dry canyons, roadsides, open oak woodlands and grasslands. Baccharis pteronioidesYerba de Pasmo grows at elevations between 3,500 and 6,000 feet and is native to Arizona, New Mexico and Texas. Baccharis pteronioides

Scientific Name: Baccharis pteronioides
Common Name: Yerba de Pasmo
Also Called:
Family: Asteraceae, Sunflower Family
Synonyms: (Baccharis ramulosa)
Status: Native
Duration: Perennial
Size: Up to 3 feet or more.
Growth Form: Shrub; shrubby stiff habit; rough gray bark; evenly branched with thick woody crowns; stems erect.
Leaves: Green; leaves sessile; leaf shape variable linear to lanceolate or spatulate; margins sharply toothed.
Flower Color: Creamy white to greenish; male and female flowers; flower heads 10 to 20, solitary on terminal leafy branchlets.
Flowering Season: April to September; April to June in California.
Elevation: 3,500 to 6,000 feet (from 1,000 feet in California.

Habitat Preferences: Dry canyons, roadsides, open oak woodlands, grasslands.

Recorded Range: Baccharis pteronioides is found in the southwestern United States in AZ, NM, TX. It is also native throughout most of Mexico. In Arizona it is found in the central and eastern ⅔ and northwest parts of the state.

North America & US County Distribution Map for Baccharis pteronioides.

U.S. Weed Information: No information available.
Invasive/Noxious Weed Information: No information available.
Wetland Indicator: No information available.
Threatened/Endangered Information: No information available.

Genus Information: In North America there are 24 species and 26 accepted taxa overall for Baccharis. World wide, The Plant List includes 430 accepted species names and includes a further 409 infraspecific rank for the genus.

In the Southwestern United States: Arizona and California each have 10 species of Baccharis, Nevada has 5 species, New Mexico has 13 species, Texas has 12 species, Utah has 5 species. All data is approximate and subject to taxonomic changes.

Comments: According to Arizona Flora, and Flora of North America, Baccharis pteronioides is reputed to be poisonous to livestock.

Also see in Southwest Desert Flora, Seepwillow, Baccharis salicifolia and Desertbroom, Baccharis sarothroides.

Baccharis pteronioides, Yerba de Pasmo has been used as a wash for rheumatism and gonorrhea by southwestern United States indigenous peoples.

  • Yavapai Drug, Antirheumatic (External). Decoction of leaves and roots used as wash for rheumatism.
  • Yavapai Drug, Venereal Aid. Decoction of leaves and roots used as wash for gonorrhea.
  • See ethno-botanical uses at Native American Ethnobotany, University of Michigan, Dearborn.

    Date Profile Completed: 11/16/2016, updated format 10/08/2017
    Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, University of California Press, Berkley and Los Angeles, California.
    U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database and USGS ITIS search - (accessed 11/16/2016)
    The Plant List (2013). Version 1.1. Published on the Internet; (accessed 11/16/2016).
    Scott D. Sundberg, David J. Bogler, FNA | Family List | FNA Vol. 20 | Asteraceae | Baccharis pteronioides de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 410. 1836.; Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford.
    SEINet synonyms, scientific names, geographic locations, general information - (accessed ).