Trixis californica, American Threefold
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)
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.
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.