Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

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

Cirsium ochrocentrum, Yellowspine Thistle

Calycoseris parryi, Yellow Tackstem

Yellow Tackstem has a showy yellow strap-like flower that prefers limestone soils; Yellow Tackstem blooms from March to June. Calycoseris parryi Yellow Tackstem is a smooth, or glabrous, species that has conspicuous dark colored glands of the upper parts of the stem and flowering parts. Calycoseris parryi Yellow Tackstem is a winter annual that is found mostly in the Mojave Desert but also in the Colorado River Basin portion of the Sonoran Desert. Calycoseris parryi Yellow Tackstem has yellow flowers, mostly inconspicuous leaves and grows up to a foot tall. Flowers bloom in single heads or in clusters of 1 or many (20 or more). Calycoseris parryi

Scientific Name: Calycoseris parryi
Common Name: Yellow Tackstem
Also Called: Tackstem
Family: Asteraceae, Sunflower Family
Synonyms: ()
Status: Native
Duration: Annual; winter annual.
Size: Up to 12 inches.
Growth Form: Forb/herb; low, branching; glabrous except for conspicuous dark colored glands on upper part of stem and on the flowering parts.
Leaves: Green; alternate; small, fine almost inconspicuous, pinnatisect into narrowly linear or filiform divisions.
Flower Color: Yellow; flowers strap-like or ligulate; fruit a fusiform achene.
Flowering Season: March to April; April to June in California.
Elevation: About 3,000 feet; below 2,000 feet in California.
Habitat Preferences: Sandy, gravelly soils, sand dunes washes, slopes and limestone ridges in lower Mojave and Colorado (western Sonoran) deserts.
Recorded Range: Yellow Tackstem is found in the southwest United States in AZ, CA, NV, UT. This species is also native to Baja California and northwest Mexico. In Arizona in is found in the northwest part of the state and northwest Maricopa County.

North America & US County Distribution Map for Calycoseris parryi.

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

Genus Information: In North America there are 2 species and 2 accepted taxa overall for Calycoseris. World wide, The Plant List includes 2 accepted species names and includes a further 2 infraspecific rank for the genus.

In the Southwestern United States: Arizona, California, Nevada and Utah each have 2 species of Calycoseris, New Mexico and Texas each have 1 species. All data is approximate and subject to taxonomic changes.

Comments: Yellow Tackstem prefers limestone soils and is primarily a Mojave Desert and western Sonoran Desert species.

Yellow Tackstem is similar in size and shape to the closely related White Tackstem, Calycoseris wrightii which differs primarily by its white flowers.

Date Profile Completed: 11/17/2016
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 11/17/2016)
The Plant List (2013). Version 1.1. Published on the Internet; (accessed 11/17/2016).
L. D. Gottlieb, FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Calycoseris parryi A. Gray in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 106. 1859.; Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford.
1993, The Jepson Manual, Citation: (accessed 11/17/2016),864,865
SEINet synonyms, scientific names, geographic locations, general information - (accessed 11/17/2016).