Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

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

Cirsium ochrocentrum, Yellowspine Thistle

Conoclinium greggii, Palmleaf Thoroughwort

Palmleaf Thoroughwort or Gregg’s Mistflower has showy flowers ranging in color from blue, to purplish-blue to lavender or purple. Plants are sold commercially for garden color.  Conoclinium greggii Palmleaf Thoroughwort or Gregg’s Mistflower has interesting flowers that have thread-like stigmas (the pollen-receptive surface of a style) giving it a unique look, almost misty. Conoclinium greggii Palmleaf Thoroughwort (Gregg’s Mistflower) has green leaves ovate-deltoid to ovate; palmate, dissected. Conoclinium greggii Palmleaf Thoroughwort (Gregg’s Mistflower is relatively rare in the United States where it is found only in western Texas, southern New Mexico to southern Arizona. Conoclinium greggii

Scientific Name: Conoclinium greggii
Common Name: Palmleaf Thoroughwort

Also Called: Gregg's Mistflower, Palm-leaf Mistflower, Palm-leaf Thoroughwort, Pinked Mistflower, Purple Palmleaf Mistflower, Purple Palmleaf Eupatorium

Family: Asteraceae, Sunflower Family

Synonyms: (Conoclinium dissectum, Eupatorium dissectum, Eupatorium greggii)

Status: Native

Duration: Perennial

Size: Up to 2 feet (61 cm)

Growth Form: Forb/herb; rhizomatus often forming knotty crowns; stems glabrous, plants erect, ascending or decumbent.

Leaves: Green, leaves ovate-deltoid to ovate; palmate, dissected.

Flower Color: Blue, purplish-blue, lavender or purple; florets with thread-like stigmas; floral heads clustered together forming unique, pretty "flowers"; fruit a cypsela (type of achene).

Flowering Season: April to August; again October to November

Elevation: 1,500 to 5,000 feet (400-1400 m).

Habitat Preferences: Variable across wide geographic range, stream beds and other waterways such as washes and ditches; plains and mesas; dry sandy or rocky soil; mesquite and creosote bush-mesquite communities.

Recorded Range: Conoclinium greggii is relatively rare in the United States where it is found only in western Texas, southern New Mexico to southern Arizona. It is also native southward to Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Sonora, Zacatecas).

North America & US County Distribution Map for Conoclinium greggii.

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

Wetland Indicator: In North America Conoclinium greggii has the following wetland designations: Arid West and Western Mountains, Valleys, and Coast FACU (Facultative Upland, usually occur in non-wetlands, but may occur in wetlands) and the Great Plains where it grows as a FACW = Facultative Wetland, usually occur in wetlands, but may occur in non-wetlands.

Genus Information: In North America there are 3 species and 5 accepted taxa overall for Conoclinium. Worldwide, The Plant List includes 4 accepted species names and a further 14 scientific names of infraspecific rank for the genus Conoclinium. Note that the genus was previously classified as Eupatorium.

In the Southwestern United States: Arizona and New Mexico each have 1 species of Conoclinium, California, Nevada and Utah have 0 species and Texas has 3 species. All data approximate and subject to revision.

Comments: This species is cultivated and sold commercially as a showy flowering plant in Arizona, California, New Mexico and Texas. These plants are sold under names of "Blue Mistflower", "Gregg's Blue Mist Flower", "Gregg's Mistflower", "Texas Ageratum" and "West Texas Ageratum".

Parts of the genus Conoclinium was previously classified as Eupatorium, however later research finds that they are more closely related to other plants of the genus Ageratum and Ageratina. This species is similar in flower as Fragrant Snakeroot, Ageratina herbacea.

Importance to Wildlife, Birds and Livestock
Potentially used for deer browse.

Special Value to Native Bees, Butterflies and Insects
Conoclinium greggii is an insect magnet. This species is known to attract Queen, Monarch butterflies, the Ocola Skipper, (Panoquina ocola) and Dukes’ Skipper, Euphyes dukesi. .

To find out more about Butterflies and Moths of North America visit BAMONA.
For excellent information on vertebrate conservation visit The Xerces Society.

The genus Conoclinium is derived from the Greek words "konos" meaning "cone" and "klinion" meaning "little bed". The reference is thought to be related to the reclining habitat of the plant.

The species epithet "greggii" is named in honor of Gregg, Josiah.


Date Profile Completed: 02/16/2020
Kearney, Thomas H., Peebles, Robert H., 1960, Arizona Flora, University of California Press, Berkley and Los Angeles, California; as Eupatorium greggii
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database and USGS ITIS search - (accessed 02/15/2020) for genus Conoclinium
The Plant List (2013). Version 1.1. Published on the Internet; (accessed 02/15/2020).
Native Plant Information Network, NPIN (2013). Published on the Internet (accessed 02/15/2020). Lady Bird Johnson Wildflower Center at The University of Texas, Austin, TX.
Thomas F. Patterson, Guy L. Nesom; Flora of North America North of Mexico |FNA | Family List |FNA Vol. 21 | Asteraceae | Conoclinium; 1. Conoclinium dissectum 3(5): 88. 1852; Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico.
'Conoclinium', Wikipedia, The Free Encyclopedia, 27 August 2018, 04:02 UTC, [accessed 15 February 2020]
SEINet synonyms, scientific names, geographic locations, general information.