>

Cirsium horridulum [Asteraceae]

Click on the images below to see larger versions.

Scientific Name Cirsium horridulum USDA PLANTS Symbol CIHO2
Common Name Yellow Thistle ITIS Taxonomic Serial No. 36379
Family Asteraceae (Sunflower) SEINet
Reference
Click Here
Description Habitat: Sandy or gravelly soils in open areas.
Plant: Erect winter annual or biennial 1 to 4 feet tall; very thick, prickly stem usually branched later near top.
Leaves: Basal rosette and alternate stem leaves, narrowly-linear to oblanceolate to elliptic in outline with spiny lobes; up to 16 inches long and 4 inches wide.
Inflorescence: Terminal, solitary or a corymb of multiple heads; each large head up to 4 inches across with many white or yellow to pink, purple or red disk florets; no rays; cup-like involucre of spiny phyllaries supported by spiny, leaf-like bracts that may be pink-tinged.
Bloom Period: February to June.
References: "Wildflowers of Texas" by Michael Eason, "Wildflowers of Texas" by Geyata Ajilvsgi, "Manual of the Vascular Plants of Texas" by Correll and Johnston and SEINet.
BONAP Distribution Map

Texas Status:
Native

© Tom Lebsack 2022