 Pink flower of Violet wood sorrel (Oxalis violacea, shamrock) on Prairie Trail in Brazos Bend State Park. Needville, Texas, April 22, 2008
 Violet wood sorrel (shamrock, Oxalis violacea?) in Big Thicket park on Sundew Trail. Texas, October 11, 2008
 Purple flowers of Violet wood sorrel (shamrock, Oxalis) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 9, 2009
 Violet wood sorrel (shamrock, Oxalis violacea?) near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 21, 2008
 Violet wood sorrel (Oxalis violacea, shamrock) on Hoots Hollow Trail in Brazos Bend State Park. Needville, Texas, February 15, 2020
 Violet wood sorrel (shamrock, Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Violet wood sorrel (shamrock, Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Pink flowers of Violet wood sorrel (Oxalis violacea, shamrock) on Hoots Hollow Trail in Brazos Bend State Park. Needville, Texas, February 15, 2020
 Flowers of violet wood sorrel (Oxalis violacea, shamrock) in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
 Bloomin violet wood sorrel (Oxalis violacea, shamrock) in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
 Pink flowers of violet wood sorrel (Oxalis violacea, shamrock) in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
 Back lit flowers of violet wood sorrel (Oxalis violacea, shamrock) in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
 Blooming yellow wood sorrel (shamrock, Oxalis dillenii?) with soldier flies (Stratiomyidae) in Big Thicket park on Sandhill Loop Trail. Texas, March 23, 2008
 Yellow flower of wood sorrel (shamrock, Oxalis dillenii?) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 13, 2012
 Violet wood sorrel (shamrock, Oxalis violacea?) in Mercer Arboretum and Botanical Gardens. Humble (Houston area), Texas, April 5, 2009
 Flower of Violet Wood Sorrel (Oxalis violacea) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 22, 2011
 Yellow wood sorrel (shamrock, Oxalis dillenii?) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, May 26, 2012
 Blooming yellow wood sorrel (shamrock, Oxalis dillenii?) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 13, 2012
 Blooming yellow wood sorrel (shamrock, Oxalis dillenii?) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 29, 2009
 Yellow wood sorrel (shamrock, Oxalis dillenii?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Flower of violet wood sorrel (Oxalis violacea) on Lone Star Hiking Trail in Sam Houston National Forest west from Richards. Texas, April 9, 2019
 Pink wood sorrel (shamrock, Oxalis violacea?) in Mercer Arboretum and Botanical Gardens. Humble (Houston area), Texas, February 8, 2009
 Violet wood sorrel (Oxalis violacea) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Sorrel rust fungus (Puccinia oxalidis) on yellow oxalis (Oxalis stricta) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019
 Common yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019
 Common yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 22, 2019
 Leaves of yellow oxalis (Oxalis stricta) with sorrel rust fungus (Puccinia oxalidis) in wet area on Raccoon Run Trail in Lick Creek Park. College Station, Texas, March 26, 2019
 Back lit Violet Wood Sorrel (Oxalis violacea) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 22, 2011
 Flowers of Violet Wood Sorrel (Oxalis violacea) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 22, 2011
 Violet wood sorrel (Oxalis violacea) on Sundew Trail in Big Thicket National Preserve. Kountze, Texas, August 2, 2014
 Violet wood sorrel (Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 3, 2024
 Violet Wood Sorrel (Oxalis violacea) blooming at fall without leaves in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 22, 2011
 Close-up of passion flower (passiflora, maypop) on Deer Run Trail in Lick Creek Park. College Station, Texas, September 4, 2008
 Violet wood sorrel (Oxalis violacea) on Lone Star Hiking Trail in Sam Houston National Forest west from Richards. Texas, April 9, 2019
 Butterfly pea (Centrosema virginianum) flower in Lick Creek park, on Deer Run Trail. College Station, June 15, 2008
 Passion flower (passiflora, maypop) in Lick Creek park, on Deer Run Trail. College Station, June 15, 2008
 Sorrel rust fungus (Puccinia oxalidis) on yellow oxalis (Oxalis stricta) in Bee Creek Park. College Station, Texas, March 29, 2022
 Underside of leaves of wood sorrel Oxalis stricta with rust fungus Puccinia oxalidis in Bee Creek Park. College Station, Texas, March 29, 2022
 Passiflora (passion flower, maypop) on Deer Run Trail in Lick Creek Park. College Station, Texas, August 28, 2008
 Flower of a thistle (Cirsium engelmannii(?)) near Deer Run Trail in Lick Creek Park. College Station, Texas, June 8, 2008
 Flower of wood sorrel (Oxalis acetosella, Russian name Kislitsa) in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Wood sorrel (Oxalis acetosella, Russian name Kislitsa) in flower in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Flower of purple gerardia (false foxglove, Agalinis purpurea) on a trail spur near Yaupon Trail in Lick Creek Park. College Station, Texas, September 23, 2008
 Passiflora foetida(?) (passion flower, maypop) on Deer Run Trail in Lick Creek Park. College Station, Texas, August 28, 2008
 Flower head of Western ironweed (Vernonia baldwini) in Lick Creek park, on Deer Run Trail. College Station, June 15, 2008
 Flower of summer-blooming thistle (Cirsium engelmannii) in Lick Creek Park, on Deer Run Trail. College Station, Texas, June 21, 2008
 Green lynx spider on a yellow aster-like flower near Deer Run Trail in Lick Creek Park. College Station, Texas, June 8, 2008
 Flower of wood sorrel (Oxalis acetosella, Russian name Kislitsa) in Dubki Park. Sestroretsk, a suburb of Saint Petersburg, Russia, May 19, 2011
 Violet Wood Sorrel (Oxalis violacea) in dew blooming at fall without leaves in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 20, 2013
 Ragweed (Ambrosia) on Deer Run Trail in Lick Creek Park. College Station, Texas, September 30, 2008
 Prairie Gaillardia (Gaillardia aestivalis) flower in Lick Creek Park, on Deer Run Trail. College Station, Texas, May 3, 2008
 Morning Glory (Purple Bindweed, Ipomoea cordatotriloba) flowers near Deer Run Trail in Lick Creek Park. College Station, Texas, September 17, 2007
 Deer Run Trail in Lick Creek Park during last rain bands of a tropical storm "Ike". College Station, Texas, September 13, 2008
 Western ironweed (Vernonia baldwini) on Deer Run Trail in Lick Creek Park. College Station, Texas, September 30, 2008
 Flower of wood sorrel (Oxalis acetosella, Russian name Kislitsa) in Pavlovsk Park. Pavlovsk, suburb of Saint Petersburg, Russia, May 18, 2015
 Back-lit purple flower of wood sorrel in Sam Houston National Forest on Little Lake Creek Loop Trail. Richards, Texas, April 4, 2010.
 Mistflower (blue boneset, Conoclinium coelestinum, Eupatorium) on Deer Run Trail in Lick Creek Park. College Station, Texas, September 30, 2008
 Small grape-like berries of peppervine (Ampelopsis arborea) in dew on Deer Run Trail in Lick Creek Park. College Station, Texas, September 30, 2008
 Potato-weed (solanum) damaged by snout beetles on Deer Run Trail in Lick Creek Park. College Station, Texas, September 30, 2008
 Snowy flowers of groundsel bush (seepwillow, Baccharis halimifolia) in dew on Deer Run Trail in Lick Creek Park. College Station, Texas, September 30, 2008
 Fluffy white flowers of groundsel bush (seepwillow, Baccharis halimifolia) on Deer Run Trail in Lick Creek Park. College Station, Texas, September 30, 2008
 Violet ruella (Ruellia caroliniensis) flower in Lick Creek Park. College Station, Texas, June 8, 2008
 Purple shamrock Oxalis regnellii Francis in Antique Rose Emporium. Independence, Texas, March 13, 2020
 Spiny button-like flower heads in umbels of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek park, on Deer Run Trail. College Station, June 15, 2008
 Deer Run Trail in Lick Creek Park. College Station, Texas, October 14, 2008
 Deer Run Trail in Lick Creek Park. College Station, Texas, October 8, 2008
 Tiny pink flowers of scarlet toothcup (Ammannia coccinea) on Closed Trail in Lick Creek Park. College Station, Texas, September 12, 2008
 Deer Run Trail bridge in Lick Creek Park. College Station, Texas, August 16, 2008
 Deer Run Trail in Lick Creek Park at mist. College Station, Texas, October 14, 2008
 Oaks on Deer Run Trail in Lick Creek Park. College Station, Texas, October 14, 2008
 Forest around Deer Run Trail in fog in Lick Creek Park. College Station, Texas, August 16, 2008
 Deer Run Trail near the bridge in Lick Creek Park. College Station, Texas, August 16, 2008
 Bridge across Lick Creek on Deer Run Trail in Lick Creek Park. College Station, Texas, July 25, 2008
 Lick Creek from a bridge on Deer Run Trail in Lick Creek Park. College Station, Texas, November 20, 2008
 Prairie Gaillardia in Lick Creek park, on Deer Run Trail. College Station, June 15, 2008
 Foggy forest around Deer Run Trail in Lick Creek Park. College Station, Texas, August 16, 2008
 Deer Run Trail approaching a bridge in Lick Creek Park. College Station, Texas, August 16, 2008
 Deer Run Trail on sewage line right of way in Lick Creek Park. College Station, Texas, November 20, 2008
 Sunflower on Deer Run Trail near a bridge in Lick Creek Park. College Station, Texas, August 28, 2008
 Bat observation blinds near Deer Run Trail in Lick Creek Park. College Station, Texas, November 20, 2008
 Cattails (typha) on Deer Run Trail in Lick Creek Park. College Station, Texas, July 25, 2008
 Yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Purple gerardia (false foxglove, Agalinis purpurea) on a trail spur near Yaupon Trail in Lick Creek Park. College Station, Texas, September 23, 2008
 Common yellow wood sorrel (Oxalis stricta) on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Dandelion seed head near Deer Run Trail in Lick Creek Park. College Station, Texas, June 8, 2008
 Wood sorrel (Oxalis acetosella, Russian name Kislitsa) in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Wood sorrel (Oxalis acetosella, Russian name Kislitsa) in Sosnovka Park. Saint Petersburg, Russia, May 10, 2016
 Blooming common yellow wood sorrel (Oxalis stricta) on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Yellow flowers of common wood sorrel (Oxalis stricta) on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Flowers of yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Passion flower in Lick Creek park, on Deer Run Trail. College Station, Texas, June 10, 2007
 Western ironweed (Vernonia texana) in Lick Creek Park, on Deer Run Trail. College Station, Texas, June 21, 2008
 Close up of yellow flowers of common wood sorrel (Oxalis stricta) on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Flowers of wood sorrel (Oxalis acetosella, Russian name Kislitsa) in Sosnovka Park. Saint Petersburg, Russia, May 10, 2016
 Blooming wood sorrel (Oxalis acetosella, Russian name Kislitsa) in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Wood sorrel (Oxalis acetosella, Russian name Kislitsa) with flowers in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Blooming wood sorrel (Oxalis acetosella, Russian name Kislitsa) in Sosnovka Park. Saint Petersburg, Russia, May 10, 2016
 Some tiny purple flowers on Post Oak Trail in Lick Creek Park. College Station, Texas, April 22, 2021
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