 Flower head of musk thistle (Carduus nutans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2021
 Close-up of a flower head of musk thistle (Carduus nutans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2021
 Flower head of Mexican hat (Ratibida columnaris) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 9, 2010
 White prickly poppy flower on field near Old Washington Town Site Loop Trail of Washington-on-the-Brazos State Historic Site. Washington, Texas, June 2, 2007
 Head of a grasshopper in dew in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 9, 2010
 Flower of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 9, 2009
 Thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 17, 2014
 Thistle flower (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 3, 2009
 Thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 27, 2008
 Thistle flower (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 5, 2022
 Purple thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 27, 2008
 Flower of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2023
 Flower bud of a thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 29, 2023
 Thistle flower near Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 3, 2008
 Opening thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 19, 2012
 Thistle flower (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 21, 2018
 Brown beetle on a thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 12, 2014
 Yellow flower of sow thistle (Sonchus oleraceus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 2022
 Blister beetles in genus Nemognatha on thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 3, 2008
 Flower of musk thistle (Carduus nutans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2021
 Blister beetle (Meloidae) in genus Nemognatha on thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 16, 2009
 Batterfly on a thistle flower (Cirsium) in a dried pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 25, 2020
 Young leaves and flower buds of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 2023
 Blister beetle in genus Nemognatha on thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 27, 2008
 Flower head of green milkweed (Asclepias viridis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 17, 2022
 Flower head of Indian paintbrush (Castilleja indivisa) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 17, 2022
 Flower head of wild carrot (Daucus pusillus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2023
 Field of prairie parsley (Polytaenia texana), home of many black swallowtail caterpillars, in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 16, 2010
 A field of wildflowers near Old Washington Town Site Loop Trail of Washington-on-the-Brazos State Historic Site. Washington, Texas, June 2, 2007
 Field of wildflowers at Old Washington Town Site Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2009
 Field of bluebonnets at Old Washington Town Site Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2009
 Field of wildflowers in mist at Old Washington Town Site Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2009
 Field of bluebonnets and paintbrush flowers at Old Washington Town Site Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2009
 Flower bud of Texas thistle (Cirsium texanum) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2021
 Field of bluebonnets and paintbrush flowers in mist at Old Washington Town Site Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2009
 Flower buds of Texas thistle (Cirsium texanum) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 3, 2021
 Young grasshopper on Mexican hat flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 5, 2010
 Flower buds of bluebonnet (lupin) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 19, 2010.
 Photographer with a tripod taking pictures of a field of bluebonnets at Old Washington Town Site Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 4, 2009
 Seed head of oriental false hawksbeard (Youngia japonica, Crepis japonica) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 9, 2010
 Flower of Snow-on-the-prairie (Euphorbia bicolor) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 21, 2010
 Flower spike of largebracted plantain (Plantago aristata) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 1, 2010
 Flower of puncturevine (Caltrop, Tribulus terrestris) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 29, 2010
 Flower of Purple gerardia (false foxglove, Agalinis purpurea) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 29, 2010
 Flower of purple gerardia (false foxglove, Agalinis purpurea) with dew in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 5, 2010
 Damselfly on a flower of purple gerardia (false foxglove, Agalinis purpurea) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 5, 2010
 Opening flower of purple gerardia (false foxglove, Agalinis purpurea) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 5, 2010
 Flower buds of Bull nettle (mala mujer, Cnidoscolus texanus) armed with stinging hairs in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 1, 2010
 Green grasshopper on a thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 5, 2022
 Winter rosette of a thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Winter rosette of a thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 7, 2024
 Close-up of a rosette of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 Winter rosette of some thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 7, 2024
 Thorny rosette of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 Sow thistle seedling near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2013
 Blooming thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2023
 Thistle (Cirsium engelmannii) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 12, 2018
 Winter rosette of sow thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 Field of wildflowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 15, 2024
 Fluffy seeds of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 20, 2022
 Purple winter rosette of sow thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 Spiny leaves of a thistle near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 7, 2024
 Thorny basal leaves of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 Pattern of a thorny rosette of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 Thorny leaves of some thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 28, 2023
 Large winter rosette of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
 Winter rosette of sow thistle near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 27, 2013
 Thorny rosette of leaves of a thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 2022
 Winter rosette of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
 Winter rosette of some thistle under trees in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 Basal leaves of bull thistle(?) in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 20, 2022
 Rosette of leaves of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 1, 2024
 Young leaves of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 2023
 Large shoot of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 2023
 Winter rosette of musk thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 8, 2021
 Thorny leaves of a rosette of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 Thorny winter rosette of a thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 1, 2020
 Young leaves of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 14, 2023
 Dry seed heads of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 20, 2022
 A field near Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 8, 2012
 Field of flowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 28, 2008
 Field of flowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 25, 2018
 Dry tree in a field in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 25, 2018
 Field of wildflowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 21, 2009
 A field of flowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 2, 2007
 Wildflowers on a field in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 4, 2022
 Blooming musk thistle (Carduus nutans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2021
 Musk thistle (Carduus nutans) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2021
 Winter rosette of a thistle under a juniper tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 20, 2022
 Small winter rosette of sow thistle near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 27, 2013
 Winter rosette of sow thistle (Sonchus) near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 27, 2013
 Rosette of sow thistle (Sonchus oleraceus) near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2013
 Musk thistle (Carduus nutans) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 19, 2021
 Purple leaves of sow thistle (Sonchus oleraceus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 28, 2023
 Thorny rosette of leaves of some thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 28, 2023
 Center part of a thorny rosette of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 11, 2023
 A field of yellow flowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 2, 2007
 Field of bluebonnet (Lupinus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 13, 2020
 A field behind a water cystern in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 25, 2018
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