Lactuca serriola

Click on the images below to see larger versions. 

Scientific Name Lactuca serriola USDA PLANTS Symbol LASE
Common Name Prickly Lettuce ITIS Taxonomic Serial No. 36608
Family Asteraceae (Sunflower) SEINet
Reference
Click Here
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, www.americansouthwest.net and SEINet.
BONAP Distribution Map

Colorado Status:
Introduced



© Tom Lebsack 2020