Sonchus asper

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Scientific Name Sonchus asper USDA PLANTS Symbol
SOAS
Common Name Spiny Sow-thistle ITIS Taxonomic Serial No.
38424
Family Asteraceae (Sunflower) SEINet Reference
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Description Habitat: Most soils and habitats, often disturbed areas; native to Europe but found almost everywhere in North America.
Plant: Erect, coarse annual up to 4 ft. tall, sometimes taller; solitary stems branched above and full of latex.
Leaves: Alternate, clasping, incised (lower) to dentate (mid-stem and above) leaves with sharp spines at lobe tips, 3 to 8 inches long overall; becoming smaller and lanceolate-deltoid above.
Inflorescence: Solitary yellow flower heads resembling dandelions atop short leafless stalks; about 1-1/8 inches across; many rays but no disk florets.
Bloom Period: All year.
References: "Wildflowers of the Texas Hill Country" by Marshall Enquist and "Wildflowers of Texas" by Geyata Ajilvsgi.
Texas Status
Introduced

© Tom Lebsack 2019