![](../../pictures/archives/compress/2023/3402/jpeg/18t.jpg) 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
![](../../pictures/archives/compress/2023/3402/jpeg/15t.jpg) Seeds of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
![](../../pictures/archives/compress/2023/3402/jpeg/16t.jpg) 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
![](../../pictures/archives/compress/2018/2241/jpeg/17t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2018
![](../../pictures/archives/compress/2018/2243/jpeg/14t.jpg) Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 11, 2018
![](../../pictures/archives/compress/2022/3134/jpeg/10t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 18, 2022
![](../../pictures/archives/compress/2019/2478/jpeg/21t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
![](../../pictures/archives/compress/2024/3505/jpeg/14t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, March 31, 2024
![](../../pictures/archives/compress/2024/3509/jpeg/24t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 12, 2024
![](../../pictures/archives/compress/2022/3126/jpeg/20t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 6, 2022
![](../../pictures/archives/compress/2019/2478/jpeg/23t.jpg) Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
![](../../pictures/archives/compress/2019/2482/jpeg/06t.jpg) Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 14, 2019
![](../../pictures/archives/compress/2019/2478/jpeg/22t.jpg) Flower of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
![](../../pictures/archives/compress/2021/2890/jpeg/21t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
![](../../pictures/archives/compress/2024/3458/jpeg/09t.jpg) Rosette of leaves of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, January 10, 2024
![](../../pictures/archives/compress/2019/2473/jpeg/02t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) on Post Oak Trail in Lick Creek Park. College Station, Texas, March 26, 2019
![](../../pictures/archives/compress/2019/2473/jpeg/01t.jpg) Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) on Post Oak Trail in Lick Creek Park. College Station, Texas, March 26, 2019
![](../../pictures/archives/compress/2019/2477/jpeg/18t.jpg) Flower of yellow thistle (Bull thistle, Cirsium horridulum) with a bronze beetle in Lick Creek Park. College Station, Texas, April 5, 2019
![](../../pictures/archives/compress/2021/2906/jpeg/11t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) on a recently built pipeline in Lick Creek Park. College Station, Texas, April 12, 2021
![](../../pictures/archives/compress/2021/2906/jpeg/12t.jpg) 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
![](../../pictures/archives/compress/2021/2879/jpeg/01t.jpg) Winter rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 11, 2021
![](../../pictures/archives/compress/2023/3402/jpeg/17t.jpg) 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
![](../../pictures/archives/compress/2021/2872/jpeg/03t.jpg) Basal leaves of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
![](../../pictures/archives/compress/2023/3374/jpeg/17t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) on a forest opening over a sewage line in Lick Creek Park. College Station, Texas, March 31, 2023
![](../../pictures/archives/compress/2021/2872/jpeg/02t.jpg) Winter rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
![](../../pictures/archives/compress/2021/2872/jpeg/01t.jpg) Large thorny rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
![](../../pictures/archives/compress/2022/3134/jpeg/11t.jpg) Yellow flower of bull thistle (Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 18, 2022
![](../../pictures/archives/compress/2022/3096/jpeg/07t.jpg) Winter rosette of bull thistle (Cirsium horridulum) with freeze in Lick Creek Park. College Station, Texas, January 3, 2022
![](../../pictures/archives/compress/2021/2890/jpeg/26t.jpg) Large flower bud of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
![](../../pictures/archives/compress/2021/2890/jpeg/23t.jpg) Yellow flowers of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
![](../../pictures/archives/compress/2021/2890/jpeg/22t.jpg) Opening flower of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
![](../../pictures/archives/compress/2021/2890/jpeg/24t.jpg) Rosette and yellow flowers of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
![](../../pictures/archives/compress/2024/3642/jpeg/18t.jpg) 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
![](../../pictures/archives/compress/2014/1412/jpeg/11t.jpg) Fluffy seeds of thistle (Cirsium) in Lick Creek Park. College Station, Texas, May 20, 2014
![](../../pictures/archives/compress/2024/3642/jpeg/17t.jpg) 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
![](../../pictures/archives/compress/2021/2890/jpeg/25t.jpg) 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
![](../../pictures/archives/compress/2021/2997/jpeg/20t.jpg) Fluffy seeds of thistle (Cirsium) in Lick Creek Park. College Station, Texas, August 1, 2021
![](../../pictures/archives/compress/2024/3642/jpeg/20t.jpg) 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
![](../../pictures/archives/compress/2024/3642/jpeg/22t.jpg) 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
![](../../pictures/archives/compress/2024/3642/jpeg/16t.jpg) 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
![](../../pictures/archives/compress/2018/2242/jpeg/14t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) on Lone Star Trail in Sam Houston National Forest, near Huntsville. Texas, April 8, 2018
![](../../pictures/archives/compress/2018/2236/jpeg/14t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum)(?) in Bastrop State Park. Bastrop, Texas, March 17, 2018
![](../../pictures/archives/compress/2024/3642/jpeg/21t.jpg) 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
![](../../pictures/archives/compress/2018/2236/jpeg/32t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum)(?) on mulch in a tree utilization site in Bastrop State Park. Bastrop, Texas, March 17, 2018
![](../../pictures/archives/compress/2024/3642/jpeg/19t.jpg) 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
![](../../pictures/archives/compress/2009/725/jpeg/09t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) on Whitman Road, near Washington. Texas, March 22, 2009
![](../../pictures/archives/compress/2024/3510/jpeg/20t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) on Richards Loop Trail in Sam Houston National Forest. Texas, April 13, 2024
![](../../pictures/archives/compress/2010/845/jpeg/06t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lake Bryan Park. Bryan, Texas, March 20, 2010.
![](../../pictures/archives/compress/2021/2919/jpeg/10t.jpg) Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Bastrop State Park. Bastrop, Texas, April 25, 2021
![](../../pictures/archives/compress/2010/852/jpeg/10t.jpg) Yellow spiny thistle (Bull thistle, Cirsium horridulum) at sunrise in Lake Bryan Park. Bryan, Texas, April 13, 2010
![](../../pictures/archives/compress/2021/2866/jpeg/06t.jpg) Bull thistle (Cirsium horridulum)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
![](../../pictures/archives/compress/2021/2866/jpeg/11t.jpg) Icy rosettes of bull thistle (Cirsium horridulum)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
![](../../pictures/archives/compress/2021/2866/jpeg/07t.jpg) Rosette of bull thistle (Cirsium horridulum)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
![](../../pictures/archives/compress/2021/2919/jpeg/09t.jpg) Bull thistle (Cirsium horridulum) in Bastrop State Park. Bastrop, Texas, April 25, 2021
![](../../pictures/archives/compress/2022/3127/jpeg/19t.jpg) Blooming bull thistle (Cirsium horridulum) on Richards Loop Trail in Sam Houston National Forest. Texas, April 9, 2022
![](../../pictures/archives/compress/2022/3127/jpeg/18t.jpg) Top view of Bull thistle (Cirsium horridulum) on Richards Loop Trail in Sam Houston National Forest. Texas, April 9, 2022
![](../../pictures/archives/compress/2020/2679/jpeg/01t.jpg) Bull thistle (Cirsium horridulum) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 5, 2020
![](../../pictures/archives/compress/2022/3109/jpeg/11t.jpg) Leaves of bull thistle (Cirsium horridulum) in area of a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 20, 2022
![](../../pictures/archives/compress/2020/2741/jpeg/18t.jpg) Seeds of summer-blooming thistle (Cirsium engelmannii) near Raccoon Run Trail in Lick Creek Park. College Station, Texas, July 22, 2020
![](../../pictures/archives/compress/2022/3109/jpeg/12t.jpg) Rosette of leaves of bull thistle (Cirsium horridulum) in area of a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 20, 2022
![](../../pictures/archives/compress/2021/2904/jpeg/03t.jpg) Bull thistle (Cirsium horridulum) on a forest clearing on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 11, 2021
![](../../pictures/archives/compress/2022/3179/jpeg/22t.jpg) Fluffy seeds of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 20, 2022
![](../../pictures/archives/compress/2018/2261/jpeg/03t.jpg) Fluffy seeds of Antelope horns milkweed (Asclepias viridis) in Lick Creek Park. College Station, Texas, May 17, 2018
![](../../pictures/archives/compress/2023/3351/jpeg/20t.jpg) Rosette of thistle (Cirsium) in Lick Creek Park. College Station, Texas, February 27, 2023
![](../../pictures/archives/compress/2021/2999/jpeg/02t.jpg) Flower of thistle (Cirsium) in Lick Creek Park. College Station, Texas, August 4, 2021
![](../../pictures/archives/compress/2023/3333/jpeg/27t.jpg) Winter rosette of thistle (Cirsium) in dew in Lick Creek Park. College Station, Texas, January 23, 2023
![](../../pictures/archives/compress/2012/1073/jpeg/11t.jpg) Blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 26, 2012
![](../../pictures/archives/compress/2012/1077/jpeg/02t.jpg) Florets of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 7, 2012
![](../../pictures/archives/compress/2012/1074/jpeg/15t.jpg) Thistle (Cirsium engelmannii) flower in Lick Creek Park. College Station, Texas, June 30, 2012
![](../../pictures/archives/compress/2012/1069/jpeg/02t.jpg) Thistle (Cirsium engelmannii) flower bud in Lick Creek Park. College Station, Texas, June 10, 2012
![](../../pictures/archives/compress/2024/3470/jpeg/18t.jpg) Thorny leaves of thistle (Cirsium) in Lick Creek Park. College Station, Texas, February 13, 2024
![](../../pictures/archives/compress/2012/1073/jpeg/12t.jpg) Flower of thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 26, 2012
![](../../pictures/archives/compress/2012/1072/jpeg/24t.jpg) Flower of thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2012
![](../../pictures/archives/compress/2012/1072/jpeg/23t.jpg) Blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2012
![](../../pictures/archives/compress/2023/3358/jpeg/04t.jpg) Thorny shoot of thistle (Cirsium) in Lick Creek Park. College Station, Texas, March 7, 2023
![](../../pictures/archives/compress/2012/1072/jpeg/17t.jpg) Thistle (Cirsium engelmannii) heads in Lick Creek Park. College Station, Texas, June 22, 2012
![](../../pictures/archives/compress/2022/3258/jpeg/02t.jpg) Fluffy seeds of cattail (Typha) in Lick Creek Park. College Station, Texas, October 10, 2022
![](../../pictures/archives/compress/2012/1072/jpeg/18t.jpg) Close up of a flower of thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2012
![](../../pictures/archives/compress/2014/1452/jpeg/18t.jpg) Summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 10, 2014
![](../../pictures/archives/compress/2022/3180/jpeg/02t.jpg) Summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2022
![](../../pictures/archives/compress/2012/1072/jpeg/01t.jpg) Spiny flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 20, 2012
![](../../pictures/archives/compress/2012/1076/jpeg/21t.jpg) Thistle flower heads (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 7, 2012
![](../../pictures/archives/compress/2012/1069/jpeg/03t.jpg) Close up of a thistle (Cirsium engelmannii) flower bud in Lick Creek Park. College Station, Texas, June 10, 2012
![](../../pictures/archives/compress/2012/1068/jpeg/25t.jpg) Thistle (Cirsium engelmannii) flower buds in Lick Creek Park. College Station, Texas, June 10, 2012
![](../../pictures/archives/compress/2012/1068/jpeg/24t.jpg) Globular flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 10, 2012
![](../../pictures/archives/compress/2022/3183/jpeg/16t.jpg) Summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 27, 2022
![](../../pictures/archives/compress/2012/1076/jpeg/13t.jpg) Thistle (Cirsium engelmannii) on sewage line right of way in Lick Creek Park. College Station, Texas, July 7, 2012
![](../../pictures/archives/compress/2014/1448/jpeg/21t.jpg) Summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 3, 2014
![](../../pictures/archives/compress/2021/2862/jpeg/26t.jpg) Winter rosette of leaves of thistle (Cirsium) in Lick Creek Park. College Station, Texas, February 1, 2021
![](../../pictures/archives/compress/2024/3500/jpeg/13t.jpg) Fluffy seed head of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 28, 2024
![](../../pictures/archives/compress/2023/3372/jpeg/26t.jpg) Fluffy seed head of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 27, 2023
![](../../pictures/archives/compress/2020/2820/jpeg/02t.jpg) Fluffy seeds of dog fennel (Eupatorium capillifolium) in Lick Creek Park. College Station, Texas, November 22, 2020
![](../../pictures/archives/compress/2022/3252/jpeg/20t.jpg) Head of cattail (Typha) with fluffy seeds in Lick Creek Park. College Station, Texas, September 29, 2022
![](../../pictures/archives/compress/2024/3505/jpeg/17t.jpg) Flower bud of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, March 31, 2024
![](../../pictures/archives/compress/2022/3183/jpeg/17t.jpg) Bumblebee on a summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 27, 2022
![](../../pictures/archives/compress/2008/650/jpeg/20t.jpg) Flower of a thistle (Cirsium engelmannii(?)) near Deer Run Trail in Lick Creek Park. College Station, Texas, June 8, 2008
![](../../pictures/archives/compress/2014/1453/jpeg/01t.jpg) Flower bud of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 10, 2014
![](../../pictures/archives/compress/2022/3180/jpeg/09t.jpg) Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2022
![](../../pictures/archives/compress/2024/3485/jpeg/20t.jpg) Leaves of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, March 12, 2024
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