perennial sowthistle USDA PLANTS Symbol: SOAR2
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Sonchus arvensis L.

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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae
Synonym(s): field sowthistle, creeping sowthistle, field sow-thistle

Perennial sowthistle is a perennial herb native to Eurasia. Stems can reach 4.9 ft. (1.5 m) in height and contain milky sap. Leaves are sessile, alternate, clasping, up to 12 in. (30 cm) long and decrease in size further up the stem, margins undulate with sharp spines. Flowering occurs in June to October, when yellow, tight, dandelion-like flower heads develop at the tips of the branches. Flowers open 2-3 hours after sunrise and close about noon. Fruits are reddish, ribbed and have a tuft of hair (pappus) at the top. Perennial sowthistle occurs along roadsides, railroads and other disturbed habitat.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s);
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Tom Heutte, USDA Forest Service, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s);
David Cappaert, Michigan State University, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Additional Resolutions & Image Usage

Feature(s); leaf margin
Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Additional Resolutions & Image Usage

Stem(s);
Michael Shephard, USDA Forest Service, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s); Fruit with pappus. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s); S. oleraceus on left; S. arvensis on right
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.

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U.S. National Parks where reported invasive:
Rocky Mountains National Park (Colorado)
Yellowstone National Park (Wyoming)



Invasive Listing Sources:
Faith Campbell, 1998
Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007