Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

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

Cirsium ochrocentrum, Yellowspine Thistle

Dieteria canescens, Hoary Tansyaster

Dieteria canescens, Hoary Tansyaster, Southwest Desert Flora Dieteria canescens, Hoary Tansyaster, Southwest Desert Flora Dieteria canescens, Hoary Tansyaster, Southwest Desert Flora   Dieteria canescens, Hoary Tansyaster, Southwest Desert Flora

Scientific Name: Dieteria canescens
Common Name: Hoary Tansyaster
Also Called: Hoary Aster, Hoary Goldenweed, Hoary Machaeranthera, Hoary Tansy-aster, and Purple Aster
Family: Asteraceae, Sunflower Family
Synonyms: (Aster canescens Machaeranthera oxylepis, Machaeranthera canescens)
Status: Native
Duration: Annual, biennial or perennial.
Size: Up to 3 feet or more.
Growth Form: Forb/herb, subshrub; 1 or more stems from base, stems green, branching above, stems pubescent variable, glandular, hairy or hairless.
Leaves: Green; small, lower and upper leaves linear, lanceolate or oblanceolate, glabrous, puberulent or canescent .
Flower Color: Purple or bluish-purple; radiate numerous flower heads, ray flowers numerous, slender, disk flowers yellow; numerous, bracts or phyllaries below flower heads variable, spreading or reflexed; fruit is an achene.
Flowering Season: June to November.
Elevation: 150 to 8,000 feet.
Habitat Preferences: Various habitats across a wide geographic range, pine forests, chaparral and upper and lower deserts, usually dry areas, open areas, roadsides and disturbed areas.
Recorded Range: In the western half of the United States, western Canada and northern Mexico. In Arizona this species occurs in the northern and southern half of the state.

U.S. Weed Information: Dieteria canescens is listed in: Weeds of the West. Plants included here may become weedy or invasive.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: Dieteria canescens is on the USDA 2012 National Wetland Plant List.
Threatened/Endangered Information: No data available

Genus Information: 3 species in Dieteria in the southwest United States and in Arizona; Dieteria canescens var. glabra, Dieteria canescens var. ambigua, and Dieteria canescens var. canescens.

Comments: Hoary Tansyaster is a common species that was recently re-classified from Machaeranthera to Dieteria. Hoary Tansyaster is highly variable across its range and similar in appearance to several Machaeranthera species but particularly similar in appearance to Tansyleaf Tansyaster, Machaeranthera tanacetifolia. In general, Hoary Tansyaster has leaves that are linear or lanceolate, not pinnatifid, and has more and narrower ray flowers that grow close together to touch each other.

Also see Mesa Tansyaster, Machaeranthera tagetina.

Date Profile Completed: 8/17/2012; Updated, 07/25/2015
References:
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database
Integrated Taxonomic Information System, ITIS, DATED, http://www.itis.gov/
Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, University of California Press, Berkley and Los Angeles, as Aster canescens.
The Jepson Manual, Citation: http://ucjeps.berkeley.edu/interchange/I_treat_indexes.html Fri Aug 17 09:49:33 2012
David R. Morgan, FNA | Family List | FNA Vol. 20 | Asteraceae | Dieteria, Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford. (accessed 08/17/2012)
SEINet for synonyms, scientific names and recorded geographic locations, http://swbiodiversity.org/seinet/
WSWS, Whitson, T.D. (ed.) et al. 1996. Weeds of the West. Western Society of Weed Science in cooperation with Cooperative Extension Services, University of Wyoming. Laramie, Wyoming.