Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

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

Cirsium ochrocentrum, Yellowspine Thistle

Perityle emoryi, Emory's Rockdaisy

Emory's Rockdaisy relatively small but pretty white and yellow flowers. This species blooms from January or February to October and November, and with good rainfall may flower year-round. Perityle emoryi Emory's Rockdaisy bracts surrounding the flower heads are linear and have oil glands. Perityle emoryi Emory's Rockdaisy is usually observed at from 1 or 2 feet (30-61 cm) tall. Plants are often upright or spreading and either delicate of robust in growth. Perityle emoryi Emory's Rockdaisy leaves are green and variable in shape; either heart- or triangular-shaped and the leaf edges may be deeply toothed, deeply cut or divided. Perityle emoryi Emory's Rockdaisy is also called Desert Rock Daisy and various habitats preferences including hillsides and rocky cliffs, sandy or gravelly soil and desert washes. Perityle emoryi

Scientific Name: Perityle emoryi
Common Name: Emory's Rockdaisy

Also called: Desert Rock Daisy, Emory Rockdaisy, Emory Rockdaisy, Emory's Rocklily

Family: Asteraceae, Sunflower Family

Synonyms: (Perityle emoryi var. nuda)

Status: Native

Duration: Annual

Size: 1 or 2 feet (30-61 cm)

Growth Form: Forb/herb; herbaceous; upright or spreading; multiple stems; plants delicate or robust; covered with soft hair or rough hairy; foliage has oil glands.

Leaves: Leaves green; variable in shape; heart- or triangular-shaped; leaf edges deeply toothed, deeply cut or divided; leaves arranged alternately along stem.

Flower Color: White with yellow center; flowers small but showy; one or more flower heads; flowers with both ray and disk florets; fruit is a cypsela.

Flowering Season: January or February to October and November - may flower year-round.

Elevation: Below 5,000 feet (1,524 m)

Habitat Preferences: Various habitats, lower deserts primarily, rocky hillsides and rocky cliffs, sandy or gravelly soil, desert washes; often associated with Creosote (Larrea) Bush Scrub and Coastal Sage Scrub in California.

Recorded Range: Found in the southwest United States in AZ, CA, NV and UT. It occurs primarily in AZ and CA. Emory's Rockdaisy is also native to Baja California where it is found throughout the entire region and to northwest Mexico as well as South America. Introduced species in Hawaii.

North America & US County Distribution Map for Perityle emoryi.

North America species range map for Emory's Rockdaisy, Perityle emoryi:

North America species range map for Emory's Rockdaisy, Perityle emoryi: Click image for full size map.
Click image for full size map

U.S. Weed Information: Unknown
Invasive/Noxious Weed Information: Unknown
Wetland Indicator: Unknown
Threatened/Endangered Information: Unknown

Genus Information: In North America there are 36 species and 36 accepted taxa overall for Perityle. Worldwide, The Plant List includes 68 accepted species names and a further 43 scientific names of infraspecific rank for Perityle.

The genus Perityle was published by George Bentham in 1844.

The genus Perityle was named by John Torrey, (1796-1873).

In the Southwestern United States: Arizona has 13 species of Perityle, California and New Mexico each have 5 species, Nevada has 7 species, Texas has 16 species, Utah has 4 species. Data approximate and subject to revision.

Comments: Emory's Rockdaisy is a pretty daisy-like adaptable wildflower common in the lower desert areas of the southwest and may become a non-aggressive weed in desert landscapes. It is extremely variable in looks and profile as it may be observed as a delicate single erect stem plants or a much more robust multi-branched or sprawling plants, and it might be slightly hairy to rough glandular hairy.

Importance to Wildlife, Birds and Livestock
Emory's Rockdaisy, Perityle emoryi showy white and yellow flowers, and their seeds and plants may be visited by hummingbirds and/or small mammals including rodents and granivorous birds in search of nectar or food.

Beneficial Value to Butterflies, Bees and Insects
Emory's Rockdaisy, Perityle emoryi brightly colored flowers, and their plants may be visited by butterflies, moths and other insects in search of food and nectar.

daisy-like flowers, showy flowers

The genus “Perityle” (Perit'yle:) from the Greek peri, “around,” and tyle, “a callus,” and meaning “around the margin,” referring to the thick calloused margin of the achenes.

The genus Perityle was published by George Bentham in 1844.

The species epithet emoryi (em'oryi/emor'yi:) is name after Major William Hemsley Emory, (1811-1887).


Date Profile Completed: 7/9/2012; updated 09/22/2020
Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, University of California Press, Berkley and Los Angeles
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database and USGS ITIS search; accessed 09/21/2020.
The Plant List (2013). Version 1.1. Published on the Internet;; accessed 09/20/2020.
Sharon C. Yarborough, A. Michael Powell, Flora of North America; Asteraceae, Perityle, 7. Perityle emoryi Torrey in W. H. Emory, Not. Milit. Reconn. 142. 1848.; Flora of North America North of Mexico. 16+ vols. New York and Oxford.
David J. Keil 2012, Perityle emoryi, in Jepson Flora Project (eds.) Jepson eFlora, /eflora/eflora_display.php?tid=4303, accessed on September 21, 2020.
FNA 2006, Jepson 2012, Kearney and Peebles 1969; Editors: L,Crumbacher2012; from SEINet Field Guide, on-line; accessed 09/20/2020.
Michael J. Plagens; Arizonensis; Field Guide; Sonoran Desert Flora; Asteraceae, Emory Rock Daisy, Perityle emoryi; accessed 09/20/2020.
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2020. Berkeley, California: The Calflora Database [a non-profit organization]. Available: - (Accessed: Sep 21, 2020).
Wikipedia contributors, 'Perityle emoryi', Wikipedia, The Free Encyclopedia, 14 February 2018, 11:31 UTC, [accessed 21 September 2020]
Seiler, John, Peterson, John, North American species range map courtesy of Virginia Tech, Dept. of Forest Resources & Environmental Conservation
SEINet synonyms, scientific names, geographic locations, general information.
Etymology: Michael L. Charters, California Plant Names: Latin and Greek Meanings and Derivations; A Dictionary of Botanical and Biographical Etymology - accessed 09/20/2020.