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Common Name:
PRICKLY LETTUCE
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Coefficient of Conservatism:
*
Coefficient of Wetness:
3
Wetness Index:
FACU
Physiognomy:
Ad B-Forb
R. W. Smith
A European weed, along roadsides and railroads; in fields, gravel pits, alleys, and disturbed sites; gardens and nurseries; sometimes in moist ground. During the decade 1884–1894, collected in six counties across the southern Lower Peninsula; not in the Upper Peninsula until 1933 and still very local there.
The stiff prickles on the midrib are unique among our species of Lactuca (though some others may have hairy midribs) and will also distinguish this species from any species of Sonchus (e.g., S. asper), which may have prickly margins but smooth midribs. Lactuca biennis may have a few bristles on the midrib beneath.
Locations
Allegan County
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Alpena County
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Antrim County
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Barry County
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Bay County
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Benzie County
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Berrien County
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Calhoun County
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Cass County
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Cheboygan County
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Emmet County
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Genesee County
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Gratiot County
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Hillsdale County
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Huron County
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Ingham County
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Isabella County
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Jackson County
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Kalamazoo County
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Kent County
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Leelanau County
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Lenawee County
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Livingston County
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Mackinac County
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Only on Bois Blanc, Mackinac, Round Islands
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Mecosta County
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Menominee County
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Midland County
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Monroe County
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Montcalm County
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Montmorency County
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Newaygo County
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Oakland County
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Oceana County
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Ogemaw County
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Ontonagon County
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Osceola County
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Oscoda County
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Otsego County
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Ottawa County
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Presque Isle County
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Saginaw County
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Sanilac County
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St. Clair County
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St. Joseph County
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Tuscola County
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Washtenaw County
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Wayne County
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Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 30, 2023. https://michiganflora.net/species.aspx?id=389.