Flowers of Smooth sow thistle (Sonchus oleraceus) on Green Circles (center-pivot irrigation) in Irkhaya (Irkaya) Farms. South-western Qatar, November 15, 2014
Giant Swallowtails (Papilio cresphontes) nectaring on a thistle flower on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, May 2, 2010
Thistle flower (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 21, 2018
Flower of a thistle (Cirsium engelmannii(?)) near Deer Run Trail in Lick Creek Park. College Station, Texas, June 8, 2008
Emerging thistle flower in Lick Creek park, on Iron Bridge Trail. College Station, June 15, 2008
Purple thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 27, 2008
Flower bud of Artichoke thistle (Cynara cardunculus) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 15, 2010
Opening thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 19, 2012
Thistle flower near Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 3, 2008
Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park, on Deer Run Trail. College Station, Texas, June 21, 2008
Pointed, leathery green bracts fold around a purple-blue immature flower head of Artichoke thistle (Cynara cardunculus), in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 14, 2009
Emerging flower from a large head of globe artichoke thistle (Cynara cardunculus) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 11, 2009
Thistle flower in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 26, 2016
Flower of yellow thistle (Bull thistle, Cirsium horridulum) with a bronze beetle in Lick Creek Park. College Station, Texas, April 5, 2019
Flower bud of thistle Cirsium texanum on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, April 26, 2020
Summer-blooming thistle flower (Cirsium engelmannii) in Lick Creek Park, on Iron Bridge Trail. College Station, July 6, 2008
Flower of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 9, 2009
Texas thistle flowers near Road 1155, north-east from Brenham, west from Dillard Road. Texas, June 2, 2007
Artichoke thistle (Cynara cardunculus) flowers in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 26, 2009
Flower head of field thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 9, 2010
Opening thistle flower in Lick Creek park, on Iron Bridge Trail. College Station, June 15, 2008
Large flower of globe artichoke thistle (Cynara cardunculus) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 11, 2009
Large flower head of Artichoke thistle (Cynara cardunculus), in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 14, 2009
Thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 27, 2008
Sow thistle (Sonchus oleraceus) flowers in TAMU Holistic Garden in Texas A and M University. College Station, Texas, January 10, 2009
Flower longhorned beetle Strange Virile Bycid (Strangalia virilis) mimicking as a wasp on a thistle in Lick Creek Park. College Station, Texas, July 13, 2008
Globular flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 10, 2012
Blister beetle in genus Nemognatha on thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 27, 2008
Summer-blooming thistle flower (Cirsium engelmannii) from above in Lick Creek Park, on Iron Bridge Trail. College Station, July 6, 2008
A thistle flower near Ring Levee Trail in Barataria Preserve, south from New Orleans. Louisiana, March 12, 2006
Immature flower head of Cabbage thistle (Cirsium oleraceum, Russian name Bodyak) in Aleksandrovsky Park in Pushkin (former Tsarskoe Selo), a suburb of Saint Petersburg. Russia, July 10, 2010
Bud of basket flower (a thistle) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 17, 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
Opening flowers of sow thistle (Sonchus oleraceus) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 24, 2009
Blister beetles (Meloidae) in genus Nemognatha on thistle flower in Old Baylor Park. Independence, Texas, May 9, 2009
Flower of thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2012
Flower of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
Thistle flower (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 3, 2009
Blister beetle (Meloidae) in genus Nemognatha on a flower of thistle in Old Baylor Park. Independence, Texas, May 10, 2008
Blister beetle (Meloidae) in genus Nemognatha on thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 16, 2009
Flower crab spider (Misumenops celer(?)) eating a skipper butterfly on a thistle in Lick Creek Park. College Station, Texas, July 30, 2009
Thistle flower (Russian name Vasiliok) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, June 23, 2009
Blister beetles in genus Nemognatha on thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 3, 2008
Thistle (Cirsium engelmannii) flower buds in Lick Creek Park. College Station, Texas, June 10, 2012
Opening thistle flower in Lick Creek Park. College Station, Texas, July 17, 2009
Flower of thistle in fields west from Deviatkino. Saint Petersburg, Russia, June 29, 2011
Flower bud of a thistle on Iron Bridge in Lick Creek Park. College Station, Texas, June 8, 2010
Close up of a thistle (Cirsium engelmannii) flower bud in Lick Creek Park. College Station, Texas, June 10, 2012
Flower-feeding scarab (Euphoria kerni(?), adult) in a thistle on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, May 2, 2010
Spiny globular flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 10, 2012
Thistle (Cirsium engelmannii) flower bud in Lick Creek Park. College Station, Texas, June 10, 2012
Spiny flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 20, 2012
Close up of a flower of thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2012
Flower of thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 26, 2012
Thistle (Cirsium engelmannii) flower in Lick Creek Park. College Station, Texas, June 30, 2012
Thistle flower heads (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 7, 2012
Thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 17, 2014
Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 1, 2014
Flower bud of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 1, 2014
Summer-blooming thistle flower (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 10, 2014
Flower bud of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 10, 2014
Brown beetle on a thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 12, 2014
Flower of summer thistle in Lick Creek Park. College Station, Texas, July 15, 2014
Flower bud of summer thistle in Lick Creek Park. College Station, Texas, July 22, 2014
Flower of summer thistle in Lick Creek Park. College Station, Texas, July 22, 2014
Flower of smooth sow thistle (Sonchus oleraceus) on Green Circles (center-pivot irrigation) in Irkhaya (Irkaya) Farms. South-western Qatar, November 15, 2014
Blue thistle flower in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 16, 2015
Flower of blue thistle in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 16, 2015
Distaff-thistle (Atractylis carduus, local names jalwa, laymoony, shuwwaykh) with a flower bud in a large roadside depression near Route 77 to Ras Laffan. Qatar, February 6, 2016
Close up of a flower bud of distaff-thistle (Atractylis carduus) in a large roadside depression near Route 77 to Ras Laffan. Qatar, February 6, 2016
Flower of distaff-thistle (Atractylis carduus, local names jalwa, laymoony, shuwwaykh) taken from a roadside of Salwa Highway. Southern Qatar, April 8, 2016
Crashed flower of distaff-thistle (Atractylis carduus, local names jalwa, laymoony, shuwwaykh) taken from a roadside of Salwa Highway. Southern Qatar, April 8, 2016
Flowers of field thistle (Cirsium) in Siverskaya, 50 miles south from Saint Petersburg. Russia, July 13, 2017
Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 11, 2018
Flower bud of 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) in Lick Creek Park. College Station, Texas, April 14, 2019
Thistle flower at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2019
Flower buds of thistle (Cirsium) in fields near Deviatkino in northern Saint Petersburg. Russia, July 25, 2016
Flower of creeping thistle (Cirsium arvense, Russian name Bodiak) in fields near Deviatkino in northern Saint Petersburg. Russia, July 25, 2016
Blue thistle flowers in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, June 5, 2017
Flower bud of a thistle at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2019
Flower of thistle (Cirsium) in Lake Bryan Park. Bryan, Texas, May 1, 2020
Batterfly on a thistle flower (Cirsium) in a dried pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 25, 2020
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
Flower bud of Texas thistle (Cirsium texanum) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2021
Opening flower 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
Rosette and yellow flowers of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
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
Large flower bud of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
Flower buds of Texas thistle (Cirsium texanum) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 3, 2021
Flower head of musk thistle (Carduus nutans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2021
Flower 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
Thorny flowers of musk thistle (Carduus nutans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2021
Flower of thistle (Cirsium) in Lick Creek Park. College Station, Texas, August 4, 2021
Yellow flower of sow thistle (Sonchus oleraceus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 2022
Yellow flower of bull thistle (Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 18, 2022
Thistle flower (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 5, 2022
Thistle flower (Cirsium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, May 31, 2022
Flower bud of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 13, 2022
Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 13, 2022
Unopened flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 13, 2022
Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2022
Flower head of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2022
Opening flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2022
Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 27, 2022
Flower buds of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, February 27, 2023
Flower buds of sow thistle (Sonchus oleraceus) in Lick Creek Park. College Station, Texas, March 2, 2023
Young leaves and flower buds of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 6, 2023
Flower buds of a thistle (Cirsium) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 26, 2023
Flower bud of a thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 29, 2023
Flower of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2023
