Hieracium caespitosum, Meadow Hawkweed

Gardens & Landscapes, Invasive Species, Extension Master Gardener November 13, 2015 Print Friendly and PDF

Invasive Species: Hieracium caespitosum, Meadow Hawkweed

Meadow hawkweed is an invasive perennial plant in the sunflower family (Asteraceae). It grows from 1 to 3 ft. (0.3 to 0.9 m) tall and produces a milky sap when crushed. Leaves are mostly basal, lance-shaped, hairy, 2 to 10 in. (5.1 to 25.4 cm) long and 1 in. (2.5 cm) wide. Flowers are yellow and dandelion-like; they develop in summer to fall. Seeds are black and tiny with an whitish pappus. Meadow hawkweed is native to Europe and occurs in fields, roadsides, and sparse woodlands. It was first found in the United States in Washington state in 1969.

What are invasive species and why should we be concerned about them? 


Taxonomy: Scientific and Common Names for This Species

Asterales > Asteraceae > Hieracium caespitosum Dumort.

Synonym(s): yellow hawkweed

Hieracium caespitosum - USDA PLANTS Profile

Distribution Maps

Meadow hawkweed - The reported distribution of this invasive species across the United States. (Source: Invasive Plant Atlas of the United States)

Up-to-the-minute distribution maps and why they are important

Reporting This Invasive Species

What is the best way and place to report the occurrence of an invasive species? 

 How to report an invasive species sighting to EDDMapS - Early Detection & Distribution Mapping System

EDDMapS - Report an invasive species to EDDMapS

Cooperative Extension Offices - Find local Cooperative Extension office on this map provided by USDA

How to Identify

This invasive species can be identified by looking for the characteristics described in the paragraphs that follow.

Plant

Meadow hawkweed is an invasive perennial plant in the sunflower family (Asteraceae). It grows from 1 to 3 ft. (0.3 to 0.9 m) tall and produces a milky sap when crushed.

meadow hawkweed (Hieracium caespitosum) meadow hawkweed (Hieracium caespitosum)
Michael Shephard, USDA Forest Service 
bugwood.org
Linda Wilson, University of Idaho, bugwood.org

Foliage

Leaves are mostly basal, lance-shaped, hairy, 2 to 10 in. (5.1 to 25.4 cm) long and 1 in. (2.5 cm) wide.

meadow hawkweed meadow hawkweed
 Tom Heutte, USDA Forest Service,
bugwood.org
Tom Heutte, USDA Forest Service, bugwood.org

Flower

Flowers are yellow and dandelion-like; they develop in summer to fall.

meadow hawkweed (Hieracium caespitosum) meadow hawkweed

oseph M. DiTomaso, University of California - Davis,  bugwood.org

Tom Heutte, USDA Forest Service,  bugwood.org

Fruit

Seeds are black and tiny with an whitish pappus.

meadow hawkweed  
USDA NRCS PLANTS Database, bugwood.org bugwood.org

 

Native Species That Resemble Meadow Hawkweed

All species within this genus, including natives, are designated as noxious weeds.

Hieracium gronovii, gronovius hawkweed - Images at invasive.org

gronovius hawkweed gronovius hawkweed
James H. Miller & Ted Bodner, Southern Weed Science Society, bugwood.org James H. Miller & Ted Bodner, Southern Weed Science Society, bugwood.org

 

- Images at invasive.org

   
bugwood.org bugwood.org

 

Additional Images for Meadow Hawkweed

Meadow hawkweed - Images at Invasive.org

 

Learning Resources for Meadow Hawkweed

 

Additional Information, Biology, Control and Management Resources

Control and management recommendations vary according to individual circumstances. Location, habitat, weather, and a variety of other conditions are factors that help determine the best treatment choice. To find the safest and most effective treatment for your situation, consult your state's land-grant institution. If you will use chemicals as part of the control process, always refer to the product label.

United States Land-Grant University System - Find your land-grant university's College of Agriculture, Cooperative Extension Service, or other related partner on this map provided by USDA.

Fire Effects Information System - USDA Forest Service

Noxious Weeds - King County

Hieracium caespitosum (Meadow Hawkweed) - Minnesota Wildflowers

Hieracium caespitosum - North Carolina Cooperative Extension

Invasive.org - Center for Invasive Species and Ecosystem Health


 

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.