Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

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

Cirsium ochrocentrum, Yellowspine Thistle

Trixis californica, American Threefold

Trixis california, American Threefold, Southwest Desert Flora Trixis california, American Threefold, Southwest Desert Flora Trixis california, American Threefold, Southwest Desert Flora Trixis california, American Threefold, Southwest Desert Flora

Scientific Name: Trixis californica
Common Name: American Threefold
Also Called: American Trixis, California Trixis, Trixis (Spanish: Hierba del Aire, Santa Lucía, Hierba del Pasmo, Ruina)
Family: Asteraceae, Sunflower Family
Synonyms: (Trixis californica var. californica)
Status: Native
Duration: Perennial
Size: To 3 feet.
Growth Form: Shrub or subshrub; erect stiff stems, branching, glandular with short hairs.
Leaves: Dark green; alternate; lanceolate, with petiole or sessile, entire or serrate, margins revolute.
Flower Color: Yellow; flower heads solitary or clustered; bracts of modified leaves surrounding flower heads; semi-radiate flowers, 4 to many; corollas, 2 lipped, outer lip is a ray-like ligule with 3 teeth, lips curled under; flowers fade to white; fruit is an achene.
Flowering Season: February to October or throughout the year.
Elevation: Up to 5,000 feet.

Habitat Preferences: Lower and upper deserts, dry sunny areas, rocky hillsides desert washes.

Recorded Range: The southwestern United States in AZ, CA, NM and TX, in Baja California and northern Mexico. Throughout much of Arizona.

North America & US County Distribution Map for Trixis californica.

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.

Genus Information: 2 species in Trixis in the southwest United States and in Arizona.

Comments: Trixis is a common plant in both lower and upper desert habitats, often growing in and among other taller shrubs and trees. It is well represented throughout its range.

Date Profile Completed: 06/08/2012, rev. 08/03/2012; Updated, 07/26/2015, updated format 10/11/2017
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database - Integrated Taxonomic Information System, ITIS, Fri Aug 3 2012 11:36:20 MDT,
Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, University of California Press, Berkley and Los Angeles
The Jepson Manual, Citation: Fri Aug 3 10:37:55 2012
David J. Keil, FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae, Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford. (accessed 08/03/2012)
SEINet for synonyms, scientific names and recorded geographic locations,