![](../../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/2012/1073/jpeg/12t.jpg) Flower of thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 26, 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/2012/1068/jpeg/25t.jpg) Thistle (Cirsium engelmannii) flower buds in Lick Creek Park. College Station, Texas, June 10, 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/2012/1072/jpeg/01t.jpg) Spiny flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 20, 2012
![](../../pictures/archives/compress/2012/1068/jpeg/24t.jpg) Globular flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 10, 2012
![](../../pictures/archives/compress/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/2012/1069/jpeg/01t.jpg) Spiny globular flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 10, 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/2012/1073/jpeg/11t.jpg) Blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 26, 2012
![](../../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/2012/1072/jpeg/23t.jpg) Blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2012
![](../../pictures/archives/compress/2022/3176/jpeg/20t.jpg) Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 13, 2022
![](../../pictures/archives/compress/2022/3176/jpeg/17t.jpg) Flower bud of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 13, 2022
![](../../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/2022/3183/jpeg/18t.jpg) Flower of 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/2022/3180/jpeg/12t.jpg) Opening flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2022
![](../../pictures/archives/compress/2022/3180/jpeg/10t.jpg) Flower head of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2022
![](../../pictures/archives/compress/2022/3176/jpeg/21t.jpg) Unopened flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 13, 2022
![](../../pictures/archives/compress/2008/653/jpeg/06t.jpg) Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park, on Deer Run Trail. College Station, Texas, June 21, 2008
![](../../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/2012/1076/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/11t.jpg) Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 1, 2014
![](../../pictures/archives/compress/2014/1448/jpeg/18t.jpg) Flower bud of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 1, 2014
![](../../pictures/archives/compress/2014/1452/jpeg/16t.jpg) Summer-blooming thistle flower (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 10, 2014
![](../../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/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/2022/3180/jpeg/02t.jpg) Summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2022
![](../../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/2008/656/jpeg/17t.jpg) Summer-blooming thistle flower (Cirsium engelmannii) in Lick Creek Park, on Iron Bridge Trail. College Station, July 6, 2008
![](../../pictures/archives/compress/2008/656/jpeg/18t.jpg) Summer-blooming thistle flower (Cirsium engelmannii) from above in Lick Creek Park, on Iron Bridge Trail. College Station, July 6, 2008
![](../../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/2014/1452/jpeg/18t.jpg) Summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 10, 2014
![](../../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/2024/3485/jpeg/20t.jpg) Leaves of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, March 12, 2024
![](../../pictures/archives/compress/2008/662/jpeg/08t.jpg) Blooming thistle (Cirsium engelmannii?) on Iron Bridge Trail in Lick Creek Park. College Station, Texas, July 30, 2008
![](../../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/2014/1448/jpeg/22t.jpg) Blooming summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 3, 2014
![](../../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/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/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/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/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/2021/2999/jpeg/02t.jpg) Flower of thistle (Cirsium) in Lick Creek Park. College Station, Texas, August 4, 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/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/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/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/21t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
![](../../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/2024/3509/jpeg/24t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 12, 2024
![](../../pictures/archives/compress/2022/3134/jpeg/10t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 18, 2022
![](../../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/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/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/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/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/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/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/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/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/2021/2906/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/2021/2890/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/2021/2872/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/2023/3402/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/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/2021/2879/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/2023/3374/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/2008/656/jpeg/15t.jpg) Summer-blooming thistles (Cirsium engelmannii) in Lick Creek Park, on Deer Run Trail. College Station, July 6, 2008
![](../../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/2014/1412/jpeg/11t.jpg) Fluffy seeds of thistle (Cirsium) in Lick Creek Park. College Station, Texas, May 20, 2014
![](../../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/2024/3470/jpeg/18t.jpg) Thorny leaves of thistle (Cirsium) in Lick Creek Park. College Station, Texas, February 13, 2024
![](../../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/2021/2997/jpeg/20t.jpg) Fluffy seeds of thistle (Cirsium) in Lick Creek Park. College Station, Texas, August 1, 2021
![](../../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/2018/2257/jpeg/02t.jpg) Fluffy seeds of bull thistle (Cirsium horridulum) in Lick Creek Park. College Station, Texas, May 7, 2018
![](../../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/2010/867/jpeg/15t.jpg) Flower bud of a thistle on Iron Bridge in Lick Creek Park. College Station, Texas, June 8, 2010
![](../../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/2024/3634/jpeg/04t.jpg) 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
![](../../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/2008/652/jpeg/13t.jpg) Emerging thistle flower in Lick Creek park, on Iron Bridge Trail. College Station, June 15, 2008
![](../../pictures/archives/compress/2008/652/jpeg/12t.jpg) Opening thistle flower in Lick Creek park, on Iron Bridge Trail. College Station, June 15, 2008
![](../../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/2018/2244/jpeg/07t.jpg) Thistle (Cirsium engelmannii) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 12, 2018
![](../../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/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/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/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/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/2012/1067/jpeg/20t.jpg) Coreopsis flower in Lick Creek Park. College Station, Texas, June 6, 2012
![](../../pictures/archives/compress/2023/3334/jpeg/13t.jpg) Thorny basal leaves of thistle (Cirsium) in Bee Creek Park. College Station, Texas, January 28, 2023
![](../../pictures/archives/compress/2023/3334/jpeg/15t.jpg) Winter rosette of leaves of some thistle (Cirsium) in Bee Creek Park. College Station, Texas, January 28, 2023
![](../../pictures/archives/compress/2023/3334/jpeg/11t.jpg) Thorny rosette of leaves of thistle (Cirsium) in Bee Creek Park. College Station, Texas, January 27, 2023
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