![](../../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/2024/3505/jpeg/14t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, March 31, 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/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/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/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/2018/2236/jpeg/14t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum)(?) in Bastrop State Park. Bastrop, Texas, March 17, 2018
![](../../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/2022/3134/jpeg/10t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 18, 2022
![](../../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/2024/3509/jpeg/24t.jpg) Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 12, 2024
![](../../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/2018/2236/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/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/2019/2482/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/23t.jpg) Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 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/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/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/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/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/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/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/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/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/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/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/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/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/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/2021/2919/jpeg/10t.jpg) Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Bastrop State Park. Bastrop, Texas, April 25, 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/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/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/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/2020/2696/jpeg/15t.jpg) Flower of thistle (Cirsium) in Lake Bryan Park. Bryan, Texas, May 1, 2020
![](../../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/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/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/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/2022/3096/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/2021/2919/jpeg/09t.jpg) Bull thistle (Cirsium horridulum) in Bastrop State Park. Bastrop, Texas, April 25, 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/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/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/2021/2866/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/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/2021/2866/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/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/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/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/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/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/2012/1069/jpeg/10t.jpg) Butterfly on a thistle in Lake Bryan Park. Bryan, Texas, June 13, 2012
![](../../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/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/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/2010/886/jpeg/13t.jpg) Yellow garden spider (Argiope aurantia) with its prey in Lake Bryan Park. Bryan, Texas, August 4, 2010
![](../../pictures/archives/compress/2010/886/jpeg/15t.jpg) Yellow garden spider (Argiope aurantia) with a green katydid in Lake Bryan Park. Bryan, Texas, August 4, 2010
![](../../pictures/archives/compress/2010/886/jpeg/14t.jpg) Yellow garden spider (Argiope aurantia) eating green katydid in Lake Bryan Park. Bryan, Texas, August 4, 2010
![](../../pictures/archives/compress/2010/852/jpeg/11t.jpg) Green plants of false indigo (yellow wisteria, Baptisia bracteata) at sunrise on an island in Lake Bryan Park. Bryan, Texas, April 13, 2010
![](../../pictures/archives/compress/2010/845/jpeg/08t.jpg) Young leaf of an oak in Lake Bryan Park. Bryan, Texas, March 20, 2010.
![](../../pictures/archives/compress/2010/845/jpeg/07t.jpg) Oak catkins in Lake Bryan Park. Bryan, Texas, March 20, 2010.
![](../../pictures/archives/compress/2024/3481/jpeg/17t.jpg) Young leaves of thistle (Cirsium) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 2, 2024
![](../../pictures/archives/compress/2023/3371/jpeg/21t.jpg) Flower buds of a thistle (Cirsium) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 26, 2023
![](../../pictures/archives/compress/2018/2260/jpeg/08t.jpg) Yellow puff (Neptunia lutea) in Lake Bryan Park. Bryan, Texas, May 16, 2018
![](../../pictures/archives/compress/2020/2696/jpeg/17t.jpg) Amanita mushroom with a pale yellow cap in Lake Bryan Park. Bryan, Texas, May 1, 2020
![](../../pictures/archives/compress/2010/868/jpeg/21t.jpg) Spider on a web in Lake Bryan Park. Bryan, Texas, June 15, 2010
![](../../pictures/archives/compress/2010/886/jpeg/12t.jpg) Sunrise in Lake Bryan Park. Bryan, Texas, August 4, 2010
![](../../pictures/archives/compress/2010/868/jpeg/23t.jpg) Flower spike of some grass in Lake Bryan Park. Bryan, Texas, June 15, 2010
![](../../pictures/archives/compress/2010/852/jpeg/12t.jpg) Butterweed (Senecio glabellus) in Lake Bryan Park. Bryan, Texas, April 13, 2010
![](../../pictures/archives/compress/2010/862/jpeg/16t.jpg) Orange milkweed (Asclepias tuberosa) in Lake Bryan Park. Bryan, Texas, May 21, 2010
![](../../pictures/archives/compress/2010/820/jpeg/10t.jpg) Dansby Power Plant in Lake Bryan Park. Bryan, Texas, January 8, 2010
![](../../pictures/archives/compress/2010/868/jpeg/26t.jpg) Flower of dayflower (Commelina) in Lake Bryan Park. Bryan, Texas, June 15, 2010
![](../../pictures/archives/compress/2018/2260/jpeg/23t.jpg) Close up of Yellow puff (Neptunia lutea) in Lake Bryan Park. Bryan, Texas, May 16, 2018
![](../../pictures/archives/compress/2020/2696/jpeg/16t.jpg) Underside of Amanita mushroom with a pale yellow cap in Lake Bryan Park. Bryan, Texas, May 1, 2020
![](../../pictures/archives/compress/2009/785/jpeg/02t.jpg) Yellow puff (Neptunia lutea) in Lake Bryan Park. Bryan, Texas, August 7, 2009
![](../../pictures/archives/compress/2018/2260/jpeg/22t.jpg) Flowers of Yellow puff (Neptunia lutea) in Lake Bryan Park. Bryan, Texas, May 16, 2018
![](../../pictures/archives/compress/2010/866/jpeg/05t.jpg) Square-Bud Primrose (Calylophus berlandieri(?)) in Lake Bryan Park. Bryan, Texas, June 2, 2010
![](../../pictures/archives/compress/2010/866/jpeg/04t.jpg) Whorled milkweed (Asclepias verticillata(?)) in Lake Bryan Park. Bryan, Texas, June 2, 2010
![](../../pictures/archives/compress/2010/862/jpeg/22t.jpg) Lady bird s centaury (Centaurium texense) in Lake Bryan Park. Bryan, Texas, May 21, 2010
![](../../pictures/archives/compress/2010/862/jpeg/17t.jpg) Orange milkweed (Asclepias tuberosa) in bloom in Lake Bryan Park. Bryan, Texas, May 21, 2010
![](../../pictures/archives/compress/2024/3531/jpeg/18t.jpg) Yellow peat mold fungus (Chromelosporium fulvum) under juniper trees near the lake in Lake Bryan Park. Bryan, Texas, May 9, 2024
![](../../pictures/archives/compress/2014/1447/jpeg/05t.jpg) Yellow puff (Neptunia lutea) in Lake Bryan Park. Bryan, TexasP, June 29, 2014
![](../../pictures/archives/compress/2024/3531/jpeg/30t.jpg) Yellow puff (Neptunia lutea) under power lines in Lake Bryan Park. Bryan, Texas, May 9, 2024
![](../../pictures/archives/compress/2013/1228/jpeg/19t.jpg) Yellow foliage of poison ivy under power lines in Lake Bryan Park. Bryan, Texas, July 16, 2013
![](../../pictures/archives/compress/2020/2696/jpeg/13t.jpg) Yellow flowers of square-bud primrose (Calylophus berlandieri) in Lake Bryan Park. Bryan, Texas, May 1, 2020
![](../../pictures/archives/compress/2018/2260/jpeg/13t.jpg) Yellow-white chlorotic leaves near the lake in Lake Bryan Park. Bryan, Texas, May 16, 2018
![](../../pictures/archives/compress/2024/3531/jpeg/19t.jpg) Close-up of yellow peat mold fungus (Chromelosporium fulvum) under juniper trees near the lake in Lake Bryan Park. Bryan, Texas, May 9, 2024
![](../../pictures/archives/compress/2010/869/jpeg/03t.jpg) Common Buckeye butterfly (Junonia coenia) in Lake Bryan Park. Bryan, Texas, June 15, 2010
![](../../pictures/archives/compress/2010/866/jpeg/06t.jpg) Common Buckeye butterfly (Junonia coenia) in Lake Bryan Park. Bryan, Texas, June 2, 2010
![](../../pictures/archives/compress/2010/868/jpeg/25t.jpg) Young red leaf of peppervine (Ampelopsis arborea) in Lake Bryan Park. Bryan, Texas, June 15, 2010
![](../../pictures/archives/compress/2010/886/jpeg/16t.jpg) Globular cluster of spiderlings (baby spiders) in Lake Bryan Park. Bryan, Texas, August 4, 2010
![](../../pictures/archives/compress/2010/866/jpeg/03t.jpg) Fruits of Mexican plum (Prunus mexicana) in Lake Bryan Park. Bryan, Texas, June 2, 2010
![](../../pictures/archives/compress/2010/868/jpeg/24t.jpg) Blooming Globe sedge (Cyperus echinatus) in Lake Bryan Park. Bryan, Texas, June 15, 2010
![](../../pictures/archives/compress/2014/1447/jpeg/09t.jpg) Seeds of yellow puff (Neptunia lutea) in Lake Bryan Park. Bryan, TexasP, June 29, 2014
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