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
Purple thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 27, 2008
Seed head of sow thistle (Sonchus) with fluffy pappus attached to seed-bearing achenes in TAMU Holistic Garden in Texas A and M University. College Station, Texas, January 31, 2009
Fluffy seeds of thistle (Cirsium) in Lick Creek Park. College Station, Texas, May 20, 2014
Blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 22, 2012
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
Painted lady butterfly (Vanessa virginiensis) on a thistle on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, May 2, 2010
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
Katydid on seeds of thistle in Lick Creek Park. College Station, Texas, July 15, 2014
Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2018
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
Texas thistle at a fence near Road 1155, north-east from Brenham, west from Dillard Road. Texas, June 2, 2007
Frozen sow thistle (Sonchus arvensis) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, December 11, 2012
Blue thistle on a trail in Sam Houston National Forest, near Road 149, near Richards. Texas, May 15, 2010
Echinops sphaerocephalus (globe thistle) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, June 21, 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
Texas thistle at roadside of Road 1155, north-east from Brenham, west from Dillard Road. Texas, June 1, 2008
Opening spherical seed head of a thistle in Lick Creek Park. College Station, Texas, July 30, 2009
Field of Texas thistle near Road FM 390 south from Lake Somerville. Texas, May 6, 2012
Summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 3, 2014
Blooming summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 3, 2014
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
Texas thistle at a fence at Road 1155, north-east from Brenham, west from Dillard Road. Texas, June 1, 2008
Globe thistle (Echinops sphaerocephalus) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, June 28, 2008
Sow thistle in TAMU Holistic Garden in Texas A and M University. College Station, Texas, January 2, 2009
Large flower of globe artichoke thistle (Cynara cardunculus) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 11, 2009
Yellow thistle (Bull thistle, Cirsium horridulum) in Lake Bryan Park. Bryan, Texas, March 20, 2010.
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
Sow thistle (Sonchus arvensis) in Mercer Arboretum and Botanical Gardens. Humble (Houston area), Texas, February 8, 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
Seed head of sow thistle (Sonchus) with fluffy pappus attached to seed-bearing achenes in TAMU Holistic Garden in Texas A and M University. College Station, Texas, February 22, 2009
Thistle with seeds and a green lynx spider in Lick Creek Park. College Station, Texas, July 30, 2009
Globular flower bud of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 10, 2012
Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
Blooming sow thistle (Sonchus oleraceus) in Antique Rose Emporium. Independence, Texas, March 2, 2020
Blister beetle in genus Nemognatha on thistle flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 27, 2008
Bud of basket flower (a thistle) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 17, 2009
Thistle (Cirsium engelmannii) heads in Lick Creek Park. College Station, Texas, June 22, 2012
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
Thistle (Cirsium engelmannii) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 12, 2018
Flower of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
Blooming thistle (Cirsium engelmannii?) on Iron Bridge Trail in Lick Creek Park. College Station, Texas, July 30, 2008
Thistle flower (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 3, 2009
Sow thistle seedling near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2013
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
Sow thistle in Mercer Arboretum and Botanical Gardens. Humble (Houston area), Texas, January 21, 2013
Winter rosette of a thistle in Bastrop State Park. Bastrop, Texas, January 5, 2013
Blooming thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, June 26, 2012
Yellow thistle (Bull thistle, Cirsium horridulum) on Whitman Road, near Washington. Texas, March 22, 2009
Yellow spiny thistle (Bull thistle, Cirsium horridulum) at sunrise in Lake Bryan Park. Bryan, Texas, April 13, 2010
Seeds of thistle in Lick Creek Park. College Station, Texas, July 15, 2014
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
Thistle (Cirsium engelmannii) on sewage line right of way in Lick Creek Park. College Station, Texas, July 7, 2012
Crab spider on a thistle in Lick Creek Park. College Station, Texas, July 7, 2012
Winter rosette of sow thistle in Washington Cemetery. Washington, Texas, January 26, 2013
"Exploding" seeds of a thistle in Lick Creek Park. College Station, Texas, July 30, 2009
Opening thistle flower in Lick Creek Park. College Station, Texas, July 17, 2009
Crab like spider in a thistle in Lick Creek Park. College Station, Texas, July 17, 2009
Flower bud of a thistle on Iron Bridge in Lick Creek Park. College Station, Texas, June 8, 2010
Winter rosette of sow thistle in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 2, 2012
Close up of a thistle (Cirsium engelmannii) flower bud in Lick Creek Park. College Station, Texas, June 10, 2012
Frostweed and a thistle on Racoon Run Trail in Lick Creek Park. College Station, Texas, July 17, 2013
Sow thistle (Sonchus) in freeze in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 3, 2014
Thorny winter rosette of a thistle in Bastrop State Park. Bastrop, Texas, January 5, 2013
Close up of "exploding" seeds of a thistle in Lick Creek Park. College Station, Texas, July 30, 2009
Rosette of sow thistle (Sonchus oleraceus) near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2013
Winter rosette of sow thistle in dew in Washington Cemetery. Washington, Texas, January 26, 2013
Flower-feeding scarab (Euphoria kerni(?), adult) in a thistle on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, May 2, 2010
Rosette and a seedling of milk thistle (Silybum marianum, Carduus marianus) at Lake Spur Trail in Bastrop State Park. Bastrop, Texas, December 25, 2011
Sow thistle (Sonchus arvensis) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 21, 2012
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
Florets of a thistle (Cirsium engelmannii) in Lick Creek Park. College Station, Texas, July 7, 2012
Thistle (Cirsium) in Bastrop State Park. Bastrop, Texas, September 15, 2012
Winter rosette of thistle in Washington Cemetery. Washington, Texas, December 8, 2012
Winter rosette of milk(?) thistle in Birch Creek Unit of Somerville Lake State Park. Texas, December 22, 2012
Winter rosette of sow thistle near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 27, 2013
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
Sow thistle in freeze in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 3, 2014
Leaf of sow thistle in freeze in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 3, 2014
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
Summer-blooming thistle (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
Crab spider on a thistle Robinson Ferry Road in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 12, 2014
Small fly on a thistle Park Hudson Trail. College Station, Texas, July 14, 2014
Bud of thistle in Lick Creek Park. College Station, Texas, July 15, 2014
Flower of summer thistle in Lick Creek Park. College Station, Texas, July 15, 2014
Blooming 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
Bumblebee on thistle in Lick Creek Park. College Station, Texas, July 26, 2014
Yellow thistle (Bull thistle, Cirsium horridulum)(?) in Bastrop State Park. Bastrop, Texas, March 17, 2018
Yellow thistle (Bull thistle, Cirsium horridulum)(?) on mulch in a tree utilization site in Bastrop State Park. Bastrop, Texas, March 17, 2018
Yellow thistle (Bull thistle, Cirsium horridulum) on Lone Star Trail in Sam Houston National Forest, near Huntsville. Texas, April 8, 2018
Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 11, 2018
Fluffy seeds of bull thistle (Cirsium horridulum) in Lick Creek Park. College Station, Texas, May 7, 2018
Rosette of leaves of thistle (Cirsium) in a pine forest on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, May 19, 2018
Sow thistle (Sonchus oleraceus) in Antique Rose Emporium. Independence, Texas, March 20, 2019
Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) on Post Oak Trail in Lick Creek Park. College Station, Texas, March 26, 2019
Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 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
Winter rosette of musk thistle (Carduus nutans, Asteraceae) in Bastrop State Park. Bastrop, Texas, February 23, 2020
Yellow thistle (Bull thistle, Cirsium horridulum) on Post Oak Trail in Lick Creek Park. College Station, Texas, March 26, 2019
Flower bud of a thistle at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2019
Sow thistle (Sonchus oleraceus) in Antique Rose Emporium. Independence, Texas, October 5, 2019
Winter rosette of a thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
Rosette of leaves of milk thistle (Silybum marianum, Carduus marianus) on a site of a recent burn in Bastrop State Park. Bastrop, Texas, February 23, 2020
Thorny winter rosette of a thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 1, 2020
Bull thistle (Cirsium horridulum) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 5, 2020
Flower of thistle (Cirsium) in Lake Bryan Park. Bryan, Texas, May 1, 2020
Shoot of a plant looking like sow thistle in Lick Creek Park. College Station, Texas, May 11, 2020
Artichoke thistle (Cynara cardunculus) in Antique Rose Emporium. Independence, Texas, May 16, 2020
Thistle (Cirsium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 14, 2020
Seeds of summer-blooming thistle (Cirsium engelmannii) near Raccoon Run Trail in Lick Creek Park. College Station, Texas, July 22, 2020
Batterfly on a thistle flower (Cirsium) in a dried pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 25, 2020
Winter rosette of thistle in Lick Creek Park. College Station, Texas, December 11, 2020
Large green winter basal rosette of thistle in Lick Creek Park. College Station, Texas, December 11, 2020
Leaves of a thistle under small oaks in Lick Creek Park. College Station, Texas, January 3, 2021
Winter rosette of a thistle at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 18, 2021
Winter rosette of leaves of sow thistle (Sonchus asper) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
Pink basal leaves of sow thistle (Sonchus asper) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
Rosette of leaves of sow thistle (Sonchus asper) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
Winter rosettes of sow thistle (Sonchus asper) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
Seedling of sow thistle (Sonchus asper) on a mat of frog fruit (Phyla incisa) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
Purple and green leaves of sow thistle (Sonchus asper) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
Large winter rosette of thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
Winter rosette of thistle (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 24, 2021
Winter rosette of leaves of thistle (Cirsium) in Lick Creek Park. College Station, Texas, February 1, 2021
Winter rosette of some thistle on Lake Somerville Trailway in area of Newman Bottom near Nails Creek Unit of Somerville Lake State Park. Texas, February 2, 2021
Prickly winter rosette of some thistle on Lake Somerville Trailway in area of Newman Bottom near Nails Creek Unit of Somerville Lake State Park. Texas, February 2, 2021
Winter rosette of musk thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 8, 2021
Rosette of sow thistle (Sonchus oleraceus) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
Bull thistle (Cirsium horridulum)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
Rosette of bull thistle (Cirsium horridulum)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
Icy rosettes of sow thistle (Sonchus oleraceus) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
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
Icy basal leaves of sow thistle (Sonchus oleraceus)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
Ice on leaves of sow thistle (Sonchus oleraceus)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
Sow thistle (Sonchus oleraceus) under icy snow on a golf course on campus of Texas A and M University. College Station, Texas, February 18, 2021
Blooming sow thistle (Sonchus oleraceus) under snow on a golf course on campus of Texas A and M University. College Station, Texas, February 18, 2021
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
Rosette of thistle under live oaks at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, February 24, 2021
Large thorny rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
Winter rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
Basal leaves of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
Winter rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 11, 2021
Flower bud of Texas thistle (Cirsium texanum) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2021
Yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 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
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
Yellow thistle (Bull thistle, Cirsium horridulum) on a recently built pipeline in Lick Creek Park. College Station, Texas, April 12, 2021
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
Flower head of 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
Flower of musk thistle (Carduus nutans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 13, 2021
Blooming 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
Musk thistle (Carduus nutans) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 19, 2021
Bull thistle (Cirsium horridulum) in Bastrop State Park. Bastrop, Texas, April 25, 2021
Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Bastrop State Park. Bastrop, Texas, April 25, 2021
Fluffy seeds of thistle (Cirsium) in Lick Creek Park. College Station, Texas, August 1, 2021
Flower of thistle (Cirsium) in Lick Creek Park. College Station, Texas, August 4, 2021
