 Flowers of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 31, 2024
 Yellow flower of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 31, 2024
 Yellow flowers of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 31, 2024
 Fluffy seed head of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 28, 2024
 Flower bud of sow thistle (Sonchus oleraceus) in Bee Creek Park. College Station, Texas, March 21, 2024
 Flower buds of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 2, 2023
 Fluffy seed head of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 27, 2023
 Sow thistle (Sonchus oleraceus) on a lawn on Lick Creek Greenway Trail. College Station, Texas, February 16, 2024
 Winter rosette of sow thistle (Sonchus oleraceus) on a lawn on Lick Creek Greenway Trail. College Station, Texas, February 16, 2024
 Purple winter rosette of sow thistle (Sonchus oleraceus) on a lawn on Lick Creek Greenway Trail. College Station, Texas, February 16, 2024
 Flower buds of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, February 27, 2023
 Blooming sow thistle (Sonchus oleraceus) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 29, 2024
 Flower and seeds of sow thistle (Sonchus oleraceus) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 29, 2024
 Yellow flower and white fluffy seeds of sow thistle (Sonchus oleraceus) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 29, 2024
 Frosted sow thistle (Sonchus oleraceus) near the creek in Bee Creek Park. College Station, Texas, January 4, 2022
 Sow thistle (Sonchus oleraceus) in Antique Rose Emporium. Independence, Texas, March 20, 2019
 Blooming sow thistle (Sonchus oleraceus) in Antique Rose Emporium. Independence, Texas, March 2, 2020
 Winter rosette of sow thistle (Sonchus oleraceus) in Washington Cemetery. Washington, Texas, January 7, 2024
 Ice on leaves of sow thistle (Sonchus oleraceus)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
 Icy rosettes of sow thistle (Sonchus oleraceus) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
 Rosette of sow thistle (Sonchus oleraceus) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
 Sow thistle (Sonchus oleraceus) under icy snow on a golf course on campus of Texas A and M University. College Station, Texas, February 18, 2021
 Icy basal leaves of sow thistle (Sonchus oleraceus)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
 Blooming sow thistle (Sonchus oleraceus) under snow on a golf course on campus of Texas A and M University. College Station, Texas, February 18, 2021
 Sow thistle (Sonchus oleraceus) flowers in TAMU Holistic Garden in Texas A and M University. College Station, Texas, January 10, 2009
 Opening flowers of sow thistle (Sonchus oleraceus) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 24, 2009
 Flowers of sow thistle (Sonchus oleraceus) on a lawn in TAMU Holistic Garden in Texas A and M University. College Station, Texas, January 10, 2009
 Rosette of sow thistle (Sonchus oleraceus) with a flower bud under snow on a golf course on campus of Texas A and M University. College Station, Texas, February 18, 2021
 Rosette of sow thistle (Sonchus oleraceus) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, February 15, 2023
 Purple winter rosette of sow thistle (Sonchus oleraceus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 7, 2024
 Violet basal leaves of sow thistle (Sonchus oleraceus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 7, 2024
 Young plant of sow thistle (Sonchus oleraceus) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 16, 2023
 Yellow flower of sow thistle (Sonchus oleraceus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 2022
 Smooth sow thistle (Sonchus oleraceus) grown near acacia tree in windblown sand on roadside of Salwa Road in area of Khashem Al Nekhsh. Southern Qatar, March 18, 2016
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, March 31, 2024
 Smooth sow thistle (Sonchus oleraceus) near Al Khor Hospital. Qatar, January 9, 2015
 Sow thistle (Sonchus oleraceus) in Antique Rose Emporium. Independence, Texas, October 5, 2019
 Blooming sow thistle (Sonchus oleraceus) in Antique Rose Emporium. Independence, Texas, April 4, 2022
 Smooth sow thistle (Sonchus oleraceus) on Green Circles (center-pivot irrigation) in Irkhaya (Irkaya) Farms. Qatar, February 20, 2015
 Fruits of smooth sow thistle (Sonchus oleraceus) on Green Circles (center-pivot irrigation) in Irkhaya Farms. Qatar, January 16, 2015
 Leaves of smooth sow thistle (Sonchus oleraceus) on Green Circles (center-pivot irrigation) in Irkhaya Farms. Qatar, January 16, 2015
 Seed head of smooth sow thistle (Sonchus oleraceus) in a roadside depression east from Al Jebail water treatment plant. Al Khor, Qatar, January 23, 2016
 Smooth sow thistle (Sonchus oleraceus) on Green Circles (center-pivot irrigation) in Irkhaya (Irkaya) Farms. South-western Qatar, November 15, 2014
 Rosette of sow thistle (Sonchus oleraceus) near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2013
 Purple leaves of sow thistle (Sonchus oleraceus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 28, 2023
 Flower of smooth sow thistle (Sonchus oleraceus) on Green Circles (center-pivot irrigation) in Irkhaya (Irkaya) Farms. South-western Qatar, November 15, 2014
 Flowers of Smooth sow thistle (Sonchus oleraceus) on Green Circles (center-pivot irrigation) in Irkhaya (Irkaya) Farms. South-western Qatar, November 15, 2014
 Leaves of sow thistle (Sonchus oleraceus) in area of a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 20, 2022
 Winter rosette of sow thistle (Sonchus oleraceus) in area of a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 30, 2022
 Rosette of leaves of sow thistle (Sonchus oleraceus) in area of a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 20, 2022
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 12, 2024
 Rosette of leaves of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, January 10, 2024
 Leaves of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, March 12, 2024
 Flower bud of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, March 31, 2024
 Yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Yellow thistle (Bull thistle, Cirsium horridulum) on Post Oak Trail in Lick Creek Park. College Station, Texas, March 26, 2019
 Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) on Post Oak Trail in Lick Creek Park. College Station, Texas, March 26, 2019
 Yellow thistle (Bull thistle, Cirsium horridulum) on a forest opening over a sewage line in Lick Creek Park. College Station, Texas, March 31, 2023
 Winter rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 11, 2021
 Thorny leaves of thistle (Cirsium) in Lick Creek Park. College Station, Texas, February 13, 2024
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 18, 2022
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 6, 2022
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2018
 Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
 Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 14, 2019
 Flower of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
 Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 11, 2018
 Seeds of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
 Leaf of a thistle (Cirsium) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, October 22, 2024
 Flower of yellow thistle (Bull thistle, Cirsium horridulum) with a bronze beetle in Lick Creek Park. College Station, Texas, April 5, 2019
 Yellow thistle (Bull thistle, Cirsium horridulum) on a recently built pipeline in Lick Creek Park. College Station, Texas, April 12, 2021
 Arrangement of seeds of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
 Fluffy seeds of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
 Metallic beetles in yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline right-of-way in Lick Creek Park. College Station, Texas, April 12, 2021
 Winter rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
 Basal leaves of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
 Immature seed head of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
 Thorny shoot of thistle (Cirsium) in Lick Creek Park. College Station, Texas, March 7, 2023
 Leaves of bull thistle (Cirsium horridulum) in ultraviolet light on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Large thorny rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
 Sow thistle (Sonchus arvensis) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 21, 2012
 Rosette of basal leaves of bull thistle (Cirsium horridulum) in ultraviolet light on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Sow thistle (Sonchus) in freeze in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 3, 2014
 Frozen sow thistle (Sonchus arvensis) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, December 11, 2012
 Purple winter rosette of sow thistle on sandy soil on sewage line right of way in Lick Creek Park. College Station, Texas, March 14, 2022
 Large flower bud of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Yellow flowers of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Opening flower of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Slender sow thistle (Sonchus tenerrimus) on sidewalk on Al Sham Street in Onaiza area. Doha, Qatar, March 31, 2016
 Winter rosette of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Thorny leaves of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Basal leaves of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Rosette and yellow flowers of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Smaller rosette of basal leaves of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Side view of a large yellow flower of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Central area of rosette of basal leaves of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Seed head of sow thistle (Sonchus) with fluffy pappus attached to seed-bearing achenes in TAMU Holistic Garden in Texas A and M University. College Station, Texas, February 22, 2009
 Seed head of sow thistle (Sonchus) with fluffy pappus attached to seed-bearing achenes in TAMU Holistic Garden in Texas A and M University. College Station, Texas, January 31, 2009
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