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Laennecia coulteri (Conyza)
Anderson, Wynn

Laennecia coulteri

Laennecia coulteri (A. Gray) G.L. Nesom

Conyza, Coulter's Horseweed, Coulter's Woolwort, Annual Horsetail

Asteraceae (Aster Family)

Synonym(s): Conyza coulteri, Conyza coulteri var. virgata, Eschenbachia coulteri

USDA Symbol: LACO13

USDA Native Status: L48 (N)


From the Image Gallery

4 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Annual
Habit: Herb
Size Notes: Up to about 5 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: White , Pink
Bloom Time: Jan , Feb , Mar , Apr , May , Jun , Jul , Aug , Sep , Oct , Nov , Dec
Bloom Notes: Flowering mostly in Fall.


USA: AZ , CA , CO , NM , NV , TX , UT

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Additional resources

USDA: Find Laennecia coulteri in USDA Plants
FNA: Find Laennecia coulteri in the Flora of North America (if available)
Google: Search Google for Laennecia coulteri


Record Modified: 2022-12-29
Research By: TWC Staff

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