Cirsium horridulum
(Yellow Thistle)
Cirsium horridulum, Beuscher State Park, Bastrop Co. 5045
Cirsium horridulum, Beuscher State Park, Bastrop Co. 5053
Cirsium horridulum, Beuscher State Park, Bastrop Co. 5059
Cirsium horridulum, Goose Island State Park, Aransas Co. 5247
Cirsium horridulum, Goose Island State Park, Aransas Co. 5240
Cirsium horridulum, Beuscher State Park, Bastrop Co. 5056
Cirsium horridulum, Beuscher State Park, Bastrop Co. 5312
Cirsium horridulum, Goose Island State Park, Aransas Co. 5238
| Scientific Name | Cirsium horridulum | USDA PLANTS Symbol | CIHO2 |
| Common Name | Bristle Thistle, Yellow Thistle | ITIS Taxonomic Serial No. | 36379 |
| Family | Asteraceae (Sunflower) | SEINet Reference |
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| 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 |
Texas Status: Native |
Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County
© Tom Lebsack 2024