|Scientific Name||Cirsium horridulum||USDA PLANTS Symbol||CIHO2|
|Common Name||Yellow Thistle||ITIS Taxonomic Serial No.||36379|
|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
Map Color Key
Banner photo of Lupinus ssp. by Rick Capozza, Austin TX
© Tom Lebsack 2023