Lactuca serriola

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Scientific Name Lactuca serriola USDA PLANTS Symbol LASE
Common Name Prickly Lettuce ITIS Taxonomic Serial No. 36608
Family Asteraceae (Sunflower) SEINet
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Description Life zones and habitat: Plains to montane (3500 to 8500 ft.); fields, waste places, disturbed areas, and roadsides.
Plant: Tall, erect biennial, 1-5 feet high, stout stem and milky sap.
Leaves: Alternate, prickly leaves, usually clasping and oblanceolate to obovate in shape; lower leaves deeply pinnately-lobed.
Inflorescence: Large panicles or corymbs of many, often 100 or more, composite yellow blossoms in open clusters, each about 1/2-inch across, with 13 to 27 rays only (no disk florets); involucre about 1/2 inch long with 3 rows of overlapping bracts.
Bloom Period: July to October.
References: "Flora of Colorado" by Jennifer Ackerfield, and SEINet.
BONAP Distribution Map

Colorado Status:

© Tom Lebsack 2021