 Puncturevine (Caltrop, Tribulus terrestris) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 1, 2019
 Puncturevine (Caltrop, Tribulus terrestris) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 7, 2010
 Flower of puncturevine (Caltrop, Tribulus terrestris) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 29, 2010
 Puncturevine (Caltrop, Tribulus terrestris) in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 27, 2013
 Puncturevine (Caltrop, Tribulus terrestris) in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 1, 2012
 Caltrop flower (puncturevine, Tribulus terrestris) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 1, 2012
 Puncturevine (Caltrop, Tribulus terrestris) on Ferry Road in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 28, 2014
 Puncturevine (Caltrop, Tribulus terrestris) with a yellow flower in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 1, 2012
 Flower of puncturevine (Caltrop, Tribulus terrestris, Tribulus lanuginosus, local name hasak) on a roadside in southern Qatar, February 11, 2014
 Puncturevine (Caltrop, Tribulus terrestris, Tribulus lanuginosus, local name hasak) in sand on roadside in southern Qatar, February 11, 2014
 Blooming puncturevine (Caltrop, Tribulus terrestris, Tribulus lanuginosus, local name hasak) on a roadside in southern Qatar, February 11, 2014
 Yellow flowers of puncturevine (Caltrop, Tribulus terrestris, Tribulus lanuginosus, local name hasak) on a roadside in southern Qatar, February 11, 2014
 Flower of puncturevine (Caltrop, Tribulus terrestris, Tribulus lanuginosus, local name hasak) in sand near a road to Saudi Arabia in southern Qatar, February 11, 2014
 Puncturevine (Caltrop, Tribulus terrestris) on a path in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, August 1, 2014
 Puncturevine (caltrop, Tribulus terrestris) on a sidewalk of Al Diwan Street. Doha, Qatar, March 28, 2014
 Fruit of Puncturevine (Caltrop, Tribulus terrestris) on a path in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, August 1, 2014
 Close up of Puncturevine (Caltrop, Tribulus terrestris) on a path in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, August 1, 2014
 Puncturevine (Caltrop, Tribulus terrestris, local name hasak) taken from Al Luqta area. Doha, Qatar, March 13, 2015
 Small yellow flower of puncturevine (Caltrop, Tribulus terrestris) in Old Baylor Park. Independence, Texas, September 6, 2009
 Puncturevine (Caltrop, Tribulus terrestris) on roadside of Salwa Road, south-west from Doha. Qatar, April 23, 2014
 Puncturevine (Caltrop, Tribulus terrestris) in a silty depression on roadside of a road to Zubara, area of Al Magdah farms. Northern Qatar, October 24, 2015
 Bull nettle (Cnidoscolus texanus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Deformed plant in a dried pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Snow-on-the-prairie (Euphorbia bicolor) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Foxtail millet grass (Setaria italica) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Close up of Snow-on-the-prairie (Euphorbia bicolor) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Pink powderpuff flower (Mimosa strigillosa) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Close up of Rabid Wolf Spider (Rabidosa rabida) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Morning Glory (Purple Bindweed, Ipomoea cordatotriloba) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Blooming plant Snow-on-the-prairie (Euphorbia bicolor) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 White prickly poppy (Argemone albiflora) with katidid in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Blooming morning Glory (Purple Bindweed, Ipomoea cordatotriloba) in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Rabid Wolf Spider (Rabidosa rabida) on a sandy road in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 10, 2019
 Shoot of cedar elm in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 9, 2019
 Bluebonnet (Lupinus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Flower of dewberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 9, 2019
 Dayflower (Commelina) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 15, 2019
 Red phlox flowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 27, 2019
 Sunflower (Helianthus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 27, 2019
 Mistletoe berries in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 8, 2019
 Catkins on a large oak in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Phlox flowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Large oak with catkins in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Pink phlox in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 2, 2019
 Spiderwort (Tradescantia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Blooming phlox in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 2, 2019
 Spiderwort (Tradescantia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 9, 2019
 Close up of masses of millipedes in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 16, 2019
 Beebalm (Monarda punctata) in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 16, 2019
 Huisache (Acacia) trees in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Leaves of Mimosa strigillosa in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 1, 2019
 Beeblossom flowers (Gaura) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 1, 2019
 Rosy corticioid fungus on an oak log in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 8, 2019
 View of FM 1155 road from Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Pink flowers of phlox in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Dirinaria lichen with apothecia in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Back lit shoot of cedar elm in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 9, 2019
 Small Dirinaria lichen in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Dirinaria(?) lichen on hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Pink phlox flowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Accumulation of elm catkins near ant burrows in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 5, 2019
 Buttercup (Ranunculus) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Spiderwort (tradescantia) on a meadow in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 2, 2019
 Winter rosette of a plant in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 2, 2019
 Blooming dayflower (Commelina) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 15, 2019
 Petals of sunflower (Helianthus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 27, 2019
 Blue spiderwort (Tradescantia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Winter rosette of a thistle in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Pink phlox flowers in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 27, 2019
 Pink spiderwort (Tradescantia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 27, 2019
 Dry prairie in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 6, 2011
 Pigeon-berry (Rivina humilis, rouge-plant, baby peppers) near a ferry site in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 5, 2018
 Shoot of hackberry (Celtis laevigata) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Blooming beebalm (Monarda punctata) in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 16, 2019
 Millipede with some yellow fungus on a rotting log in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 16, 2019
 Mustang grape (Vitis mustangensis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Giant ragweed (Ambrosia trifida) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 15, 2019
 Flowers of beebalm (Monarda punctata) in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 16, 2019
 Prickly pear cacti (Opuntia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Prickly pear cacti and dry trees in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Bull Nettle (Cnidoscolus texanus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 15, 2019
 Eastern poison ivy (Toxicodendron radicans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Corn salad (Valerianella) near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Fruticous lichens on a small tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 27, 2019
 Fragrant flatsedge (Cyperus odoratus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 15, 2019
 Medallion lichen Dirinaria confusa on an oak in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 2, 2019
 Small Nolanea mushroom on a meadow in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 2, 2019
 Fringe lichen (Heterodermia) on a tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Young leaf of Virginia creeper in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Zizotes milkweed (Asclepias oenotheroides) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 15, 2019
 Script lichen (Graphis) on a tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 False dandelion (Pyrrhopappus carolinianus) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Milkcap mushrooms Lactarius subserifluus in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 6, 2019
 Fringe lichen (Heterodermia) on hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Young leaves on a pecan tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Saucer lichen Ochrolechia on a tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Ruffle lichen (Parmotrema) on a tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Coastal sandbur (Cenchrus spinifex) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 15, 2019
 Medallion lichen (Dirinaria confusa) on an oak in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 12, 2019
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